We did this Borax snowflake craft with a kindergarten classroom recently and it went great. Obviously many parts of this would be too hard for a not-quite-2-year-old, but they could help twist the pipe cleaners and do some carefully supervised stirring. Pulling out the finished snowflakes in the morning is the really fun part, and they could do that part on their own. They look really cool.Â
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You might need a bit more than the 3 Tbsp/1 cup water mentioned in the link -- you want the solution to be supersaturated, so continue adding a little Borax to the boiling water until there are a few undissolved flakes on the bottom of the jar.Â