{"id":8934,"date":"2025-09-03T09:48:45","date_gmt":"2025-09-03T09:48:45","guid":{"rendered":"https:\/\/chromeclair.com\/?p=8934"},"modified":"2025-11-09T05:34:39","modified_gmt":"2025-11-09T05:34:39","slug":"what-are-organic-pigments","status":"publish","type":"post","link":"https:\/\/chromeclair.com\/it\/what-are-organic-pigments\/","title":{"rendered":"Che cosa sono i pigmenti organici?"},"content":{"rendered":"<p>I pigmenti organici sono importanti coloranti, onnipresenti nella nostra vita. Questo articolo spiegher\u00e0 cosa sono i pigmenti organici suddividendoli in sei punti chiave:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Definizione di pigmenti organici<\/strong><\/li>\n\n\n\n<li><strong>Caratteristiche dei pigmenti organici<\/strong><\/li>\n\n\n\n<li><strong>Propriet\u00e0 del colore<\/strong><\/li>\n\n\n\n<li><strong>Classificazione dei pigmenti organici<\/strong><\/li>\n\n\n\n<li><strong>Applicazioni dei pigmenti organici<\/strong><\/li>\n\n\n\n<li><strong>Storia e tendenze di sviluppo<\/strong><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-1024x616.webp\" alt=\"\" class=\"wp-image-8936\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/1-7-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Definizione di pigmenti organici<\/strong><strong><\/strong><\/p>\n\n\n\n<p>I pigmenti organici sono una classe di coloranti ottenuti da composti organici che possiedono una serie di propriet\u00e0 pigmentarie. A differenza dei coloranti, i pigmenti organici non hanno affinit\u00e0 con gli oggetti che sono destinati a colorare. Per aderire alle superfici o essere incorporati negli oggetti per impartire il colore, necessitano di adesivi o sostanze che formano una pellicola.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-1024x616.webp\" alt=\"\" class=\"wp-image-8937\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/2-5-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>I pigmenti organici sono insolubili in acqua o nei solventi. Tuttavia, non tutte le sostanze organiche insolubili possono essere utilizzate come pigmenti organici. I pigmenti organici colorano gli oggetti disperdendo particelle fini nel mezzo che devono colorare. Pertanto, le loro prestazioni dipendono non solo dalla loro struttura chimica, ma anche dai seguenti fattori:<\/p>\n\n\n\n<p><strong>- Dimensione e distribuzione delle particelle del pigmento<\/strong><strong><\/strong><\/p>\n\n\n\n<p><strong>- Stato fisico della superficie delle particelle<\/strong><strong><\/strong><\/p>\n\n\n\n<p><strong>- Polarit\u00e0 e forma cristallina<\/strong><strong><\/strong><\/p>\n\n\n\n<p><strong>- Compatibilit\u00e0 con il mezzo<\/strong><\/p>\n\n\n\n<p>Molti produttori di pigmenti, oltre a sviluppare nuove variet\u00e0 strutturali, si dedicano anche alla ricerca delle propriet\u00e0 superficiali dei pigmenti. L'obiettivo \u00e8 quello di sviluppare prodotti con diverse propriet\u00e0, come la facilit\u00e0 di dispersione, l'elevata trasparenza, l'alta forza colorante e l'eccellente fluidit\u00e0, per migliorare la qualit\u00e0 del prodotto.<\/p>\n\n\n\n<p>Le propriet\u00e0 dei pigmenti includono la resistenza alla luce solare, all'immersione in acqua, agli acidi e agli alcali, ai solventi organici, al calore, alla stabilit\u00e0 cristallina, alla disperdibilit\u00e0 e al potere coprente.<\/p>\n\n\n\n<p><strong>Caratteristiche dei pigmenti organici<\/strong><strong><\/strong><\/p>\n\n\n\n<p><strong>-Processo di produzione:<\/strong>&nbsp;Gli intermedi, le attrezzature e i processi di sintesi necessari per la loro produzione sono simili a quelli utilizzati per la produzione di coloranti, quindi sono spesso prodotti all'interno dell'industria dei coloranti.<\/p>\n\n\n\n<p><strong>-Confronto con i pigmenti inorganici:<\/strong><strong><\/strong><\/p>\n\n\n\n<p>- Vantaggi: In genere hanno un'elevata forza colorante, sono facili da macinare e disperdere, sono meno inclini alla sedimentazione e hanno colori vivaci.<\/p>\n\n\n\n<p>- Svantaggi: In genere hanno una scarsa resistenza alla luce, al calore e agli agenti atmosferici.<\/p>\n\n\n\n<p>- Applicazioni: Sono comunemente utilizzati per colorare materiali come inchiostri, rivestimenti, prodotti in gomma, plastica, cancelleria e materiali da costruzione.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-1024x616.webp\" alt=\"\" class=\"wp-image-8938\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/3-5-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Propriet\u00e0 cromatiche dei pigmenti organici<\/strong><strong><\/strong><\/p>\n\n\n\n<p>- Colori vivaci e forte forza colorante<\/p>\n\n\n\n<p>- Bassa densit\u00e0 e non tossicit\u00e0<\/p>\n\n\n\n<p>- Tuttavia, alcune variet\u00e0 spesso non sono resistenti alla luce, al calore, ai solventi e alla migrazione come i pigmenti inorganici.<\/p>\n\n\n\n<p>La variet\u00e0 di colori \u00e8 infinita e variopinta. Ogni colore pu\u00f2 essere determinato da tre parametri:<\/p>\n\n\n\n<p>(1) Tonalit\u00e0: La caratteristica che distingue i colori l'uno dall'altro, che pu\u00f2 distinguere il rosso, il giallo, il verde, il blu, il viola, ecc.<\/p>\n\n\n\n<p>(2) Luminosit\u00e0 (brightness): Valore caratteristico che indica la variazione di luminosit\u00e0 e oscurit\u00e0 della superficie di un oggetto.<\/p>\n\n\n\n<p>(3) Saturazione (croma): Valore caratteristico che indica l'intensit\u00e0 del colore sulla superficie di un oggetto.<\/p>\n\n\n\n<p>I colori in natura sono sempre diversi, ma i pi\u00f9 elementari sono i tre colori primari: rosso, giallo e blu.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-1024x616.webp\" alt=\"\" class=\"wp-image-8939\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/4-5-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Classificazione dei pigmenti organici <\/strong><strong><\/strong><\/p>\n\n\n\n<p>Esistono molte variet\u00e0 di pigmenti organici e molti metodi di classificazione:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Classificazione in base allo spettro cromatico Classificazione in pigmenti gialli, arancioni, rossi, viola, marroni, blu, verdi, ecc.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-1024x616.webp\" alt=\"\" class=\"wp-image-8940\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/5-8-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Classificazione in base alla funzione Classificazione in pigmenti ordinari, pigmenti fluorescenti, pigmenti perlescenti, pigmenti cambia colore, ecc.<\/li>\n\n\n\n<li>Classificazione per oggetto di applicazione Classificazione in pigmenti per rivestimenti, pigmenti per inchiostri, pigmenti per materie plastiche e gomma, pigmenti per cosmetici, ecc.<\/li>\n\n\n\n<li>Classificazione per struttura molecolare<\/li>\n<\/ul>\n\n\n\n<p>Pigmenti azoici: Pigmenti contenenti un gruppo azoico (-N=N-)<\/p>\n\n\n\n<p>Pigmenti di ftalocianina: come il blu ftalocianina e il verde ftalocianina.<\/p>\n\n\n\n<p>Pigmenti policiclici condensati<\/p>\n\n\n\n<p>Altri pigmenti strutturali<\/p>\n\n\n\n<p>Nota: i pigmenti azoici e i pigmenti a base di ftalocianina rappresentano oltre il 90% di tutti i pigmenti organici e sono prodotti principalmente in Europa occidentale, Stati Uniti e Giappone.<\/p>\n\n\n\n<p><strong>Applicazioni dei pigmenti organici<\/strong><strong><\/strong><\/p>\n\n\n\n<p>Grazie alle loro eccellenti propriet\u00e0, i pigmenti organici sono ampiamente utilizzati in numerosi settori industriali:<\/p>\n\n\n\n<p>- Industria degli inchiostri: Una delle aree di applicazione pi\u00f9 vaste, in particolare gli inchiostri da stampa (offset, flessografici e rotocalco), che richiedono colori vivaci, elevata forza colorante, particelle fini ed eccellente disperdibilit\u00e0.<\/p>\n\n\n\n<p>- Industria dei rivestimenti: Utilizzato in varie vernici e rivestimenti, in particolare nel settore automobilistico, industriale e delle vernici per esterni, dove la resistenza agli agenti atmosferici e alla luce \u00e8 fondamentale.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-1024x616.webp\" alt=\"\" class=\"wp-image-8941\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/6-6-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>- Industria delle materie plastiche: Utilizzati per colorare varie materie plastiche, i pigmenti richiedono un'eccellente resistenza al calore (150\u00b0C-280\u00b0C), resistenza alla migrazione e buona disperdibilit\u00e0.<\/p>\n\n\n\n<p>- Fibra tessile: Attraverso la colorazione pre-slurry, i pigmenti vengono mescolati uniformemente ai polimeri fusi e poi filati per produrre fibre colorate.<\/p>\n\n\n\n<p>- Applicazioni cosmetiche: Applicazioni in ombretti, rossetti e smalti gel. I pigmenti organici offrono un'ampia gamma di colori vivaci, tra cui il rosso, il blu ftalocianina e il verde ftalocianina. I pigmenti organici offrono un'eccellente forza colorante e stabilit\u00e0 del colore, consentendo allo smalto gel di ottenere colori vibranti.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-1024x616.webp\" alt=\"\" class=\"wp-image-8942\" srcset=\"https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-1024x616.webp 1024w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-300x181.webp 300w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-768x462.webp 768w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-1536x925.webp 1536w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-2048x1233.webp 2048w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-18x12.webp 18w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-990x596.webp 990w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-441x265.webp 441w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-800x482.webp 800w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-150x90.webp 150w, https:\/\/chromeclair.com\/wp-content\/uploads\/2025\/09\/c-2-1-500x301.webp 500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>- Altri settori: prodotti in gomma, cuoio, cartotecnica, ceramica, imballaggio alimentare, stampa di imballaggi farmaceutici, giocattoli per bambini, articoli di cancelleria, ecc.<\/p>\n\n\n\n<p><strong>Storia e tendenze di sviluppo<\/strong><strong><\/strong><\/p>\n\n\n\n<p>Lo sviluppo dei pigmenti organici ha attraversato grosso modo tre fasi:<\/p>\n\n\n\n<p>(1) Prime esplorazioni (fine XIX secolo-inizio XX secolo): Nel 1856, William Perkin sintetizz\u00f2 il primo colorante organico \"porpora di anilina\", segnando l'inizio dell'era dei pigmenti organici sintetici.<\/p>\n\n\n\n<p>(2) Rapido sviluppo (anni '20-'60): La crescita dell'industria della stampa a colori ha promosso lo sviluppo dei tradizionali pigmenti azoici e dei pigmenti a base di ftalocianina.<\/p>\n\n\n\n<p>(3) Modernizzazione e diversificazione (dagli anni '80 a oggi): Il progresso delle discipline di base ha favorito il salto di qualit\u00e0 della tecnologia dei pigmenti organici e l'invenzione dei pigmenti DPP \u00e8 una pietra miliare.<\/p>\n\n\n\n<p><strong>Lo sviluppo futuro dei pigmenti organici si riflette principalmente in:<\/strong><\/p>\n\n\n\n<p><strong>- Prestazioni elevate:<\/strong>&nbsp;Sviluppare pigmenti in grado di resistere meglio ad ambienti difficili (come temperature pi\u00f9 elevate e raggi ultravioletti pi\u00f9 forti).<\/p>\n\n\n\n<p><strong>- Protezione e sicurezza ambientale: <\/strong>Sviluppo di pigmenti organici ecocompatibili, meno tossici e privi di metalli pesanti e ammine aromatiche nocive.<\/p>\n\n\n\n<p><strong>Sviluppo di nuovi materiali: <\/strong>Ad esempio, esplorando nanopigmenti ibridi organico-inorganici derivati da piante naturali.<\/p>\n\n\n\n<p><strong>Sintesi<\/strong><\/p>\n\n\n\n<p>I pigmenti organici, coloranti indispensabili nell'industria e nella vita moderna, sono disponibili in un'ampia variet\u00e0 di tipi, con propriet\u00e0 diverse e una vasta gamma di applicazioni. Dalle plastiche di tutti i giorni ai materiali stampati, dai rivestimenti per autoveicoli ai tecnopolimeri e ai cosmetici, questi pigmenti creano colori vivaci.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Organic pigments are important colorants, ubiquitous in our lives. This article will explain what organic pigments are by dividing them into six key points: Definition of Organic Pigments Organic pigments are a class of colorants made from organic compounds that possess a range of pigmentary properties. Unlike dyes, organic pigments lack affinity for the objects [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8934","post","type-post","status-publish","format-standard","hentry","category-gel-polish"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What are organic pigments\uff1f<\/title>\n<meta name=\"description\" content=\"Organic pigments are important colorants, ubiquitous in our lives. 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