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What tools should be used to color children's paintings (primary school children's painting competition, without paint or anything, is sketch paper)
Gouache pigment is no problem, the trademark should be printed with advertising color, Marley, Windsor Newton and other words.

Either an oil painting stick, in fact, the effect is not bad, if it is not a flat painting, it is not easy to use.

Toner can also be mixed. Personally, I suggest using colored lead.