50% gum arabic ( gum acacia) has been used as an effective varnish. It is relatively inexpensive and renewable. $25.00 (postpaid USD) for 2.5 lbs. (4.4. kilo) via "Amazon".
Of course, artists have used this binder in preparing venerable watercolors. I can prpare powdered gum arabic at the 50% (m/v) level by shaking in water overnight.
It can take up selected azo dyes easily , the latter prepared by "grind technology". Pesyan and co-workers demonstrated this solvent-free approach. Thus, a green methodology for producing water-based dyes for artwork and related applications.
Journal of the Chinese Chemical Society, 2009, 56, 1018-1027
Can be Azo Dyes Obtained by Grinding under Solvent-free Conditions?
Nader Noroozi-Pesyan,* Jabbar Khalafy and Zahra Malekpoor
Department of Chemistry, Faculty of Science, Urmia University, 57159, Urmia, Iran
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