Should I use washable paint or stamp ink?

I am doing a gender reveal this Saturday and one of the decorations I have made is a tree I painted onto stretch canvas. The idea is the there will be three options (either paint or stamp ink) in pink, blue, or green. Each person attending is suppose to put their thumbprint of whichever color (pink and blue for if... show more I am doing a gender reveal this Saturday and one of the decorations I have made is a tree I painted onto stretch canvas. The idea is the there will be three options (either paint or stamp ink) in pink, blue, or green. Each person attending is suppose to put their thumbprint of whichever color (pink and blue for if they think it's a girl or boy or green if they don't know). The problem I'm having is trying to figure out if it would be better to use washable paint or stamp ink for the thumbprints. I was originally going to use stamp ink, but now I think it may not work as good as the paint.
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