The Property of Screen Ink from Natural Mordant, Colorant, and Additive for Art
Pratoomtong Trirat

Abstract
The present research employed experimental research approach aiming at 1) comparing the values of density of screen inks using natural mordant derived from banana gum and papaya gum, and additives including copper sulfate, sodium chloride, and aluminium sulfate; 2) comparing the L* a* b*values of yellow colorants between curcuma powder and dried chrysanthemumseeds, red between rosella and pitaya, blue between indigo and baphicacan thus cusia, black between rambutan seeds and ebony fruits; and 3) exploring the opinions of product designers, arts teachers, and general people towards screen ink from nature. The sample includes 30 arts teachers and product designers, and 200 general people. The results show the best color fastness given by banana gum and papaya gumas mordant and sodium chloride as additive. However, papaya gum provided better color fastness while banana gum provided more color density. The values of L* a* b*of colors from natural colorants with the same shade were in similar direction. In the designers’ views, these colors can be utilized in drawing the patterns of products and in teaching arts that use screen printing system and other combined techniques.

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