Watercolor pans and underglaze crayons, to me, are ways of coloring ceramics that would be great for kids, newcomers to the craft, easily transported and relatively easy to make.
Pasler Underglaze Semi-moist Watercolor Set - 24 - Color with 1 -portalbe paint brush in Pan.
Spring ceramic underglaze color watercolor painter joint name lemon olive leaf small dish measuring cup - AliExpress
Art Supply Review: Angora Watercolors
Underglaze Watercolors on Bisqueware
Watercolor Pottery
Making An Underglaze Watercolor Pan Set
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Help! Cobalt blue underglaze + clear glaze combo recommendations? : r/Pottery
AMACO Non-Toxic Semi-Moist Underglaze Set - C in Pan, 1.5 oz, Assorted Color, Set of 8
Copper Tin Wash – Looks Like Christmas