Hurray! It worked! You would hardly believe all these fabrics, both natural and synthetic, have been through exactly the same dyeing process, but they have. Proof positive for the little darlings that fibre reactive dyes only work on natural fabrics.
These are supposed to be self coloured but even distribution of dye was not an issue so we didn't spend a lot of time squishing the plastic bags about in case we stuck out little fingers through them, which would have been an issue. Tie dyeing next. That should be even more fun.