KayH KayH
Could I premix the dyes 12 hours before we plan to use them. They will be used for an 8th grade project that meets only for 50 minutes each day, and we need to do our work in increments.

Many thanks for your advice.
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pburch pburch
You can mix the dyes a couple of days before use, as long as your water has a neutral pH (neither acid nor alkaline), and as long as not even a single drop of soda ash comes into contact with the dyes before you're ready to use them.

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