Heating Procion MX Dyes and Science Sundays

While discovering that Procion MX dyes are very happy to dye wools, I came across something else that gave me pause for thought. Although there’s not a wealth of information on using Procion MX dyes with acid, most of the advice that is out there says you need to steam or heat the fibre after applying the dye.

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For acid dyes, heating the dyebath is standard practice to help fix the dyes. Fibre reactive dyes, like Procion MX, don’t require this, which is definitely an advantage when trying to do large bits of tie-dying. The standard advice when working with fibre reactive dyes on cellulose fibres and silks is to do your dyeing, then leave your fibre damp with the dye on it for at least a good few hours, closer to 24, if you want strong colours.

As I tend to like very intense, saturated colours, I tend to err on the side of giving the dye a longer reaction time.  For some short-sighted reason, I’d always assumed that there was some kind of degradation of the Procion dyes at higher temperatures, hence leaving them to react at ‘room temperature’ but seeing as steaming the wool lately with Procion dyes had worked just fine, that obviously couldn’t be the case.

Was there really a way to go speed up Procion dyeing so I didn’t have to wait so long to see what wonderful mess I’d made?

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