From Jack Milgram at Custom Writing.
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Tyson Adams 
I’m rather skeptical, I have to admit.
Now I want to know when colored paper came into being…
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Adding colour to paper is part of the process of making paper. Probably not common, especially for blue paper – blue being expensive and rare colouring until relatively recently. But here is a letter from Dumas:
https://www.biblioctopus.com/pages/books/148/alexandre-dumas-fils/signed-quotation-in-ink
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Thanks! Glad to get some verification….
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And another:
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