Please read the Scribal Handbook. It contains a lot of useful information, including guidelines for completing pre-printed award scrolls:

Winsor and Newton have some useful information on their site.

Understanding the Meaning of ‘Body Colour’ in gouache

Why does Winsor & Newton refer to colour bias rather than Munsell Ratings?

Understanding the Permanence of W& N colours:

Understanding the lightfast, permanence and archival quality of inks:

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