From this it's clear that the indicator paper is not nearly as sensitive as the raw indicator dye - not sure how to combat this. Am actively seeking pH neutral paper, having discovered that the latest batch of 'acid free' paper I bought is much more alkaline than the last (I know because the paper turned greenish before I even put anything else on it.)
Having said that, as Hannah so kindly pointed out, it's an exciting day - I will have to see just how long the colour lasts, because as they are in this photo - there's a huge colour disparity between samples; this might make an interesting comparison with the samples in their natural state, or even just an artwork by itself.
Am also still looking for an appropriate box for a glass sample jar to be displayed in.
There's a nifty explanation of using redcabbage indicator here, which also has a sweet picture of the range of results.
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