ChristinLang
Joined: 13 Aug 2009 Posts: 1 Location: United States
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Posted: Thu Aug 13, 2009 12:22 pm Post subject: |
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| Various colored juices, extracts, and suspensions of substances from plants, animals, and minerals also have been used as inks, including alizarin, indigo, pokeberries, cochineal, and sepia. For many centuries, a mixture of a soluble iron salt with an extract of tannin was used as a writing ink and is the basis of modern blue-black inks. |
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