ever seen your ice cup's plastic spoon react with water or other solvents?
@Steevan: you might start your research from the links below and a google search for this terms: polarity-sensitive dye
the links:
https://en.wikipedia.org/wiki/Solvatochromism
https://en.wikipedia.org/wiki/Brooker's_merocyanine
https://www.researchgate.net/publication/231245521_Solvatochromic_Dyes_as_Solvent_Polarity_Indicators
Article Solvatochromic Dyes as Solvent Polarity Indicators
What you understand by react may be soluble?! The only type of dyes I know reacting with water are reactive dyes, and seldom change the color by this reaction, the chromophore being in another part of the dye molecule, not in the reactive one. The color of a dye may change with the solvent polarity as it has been already said.
see also the book:
Reichardt, Christian; Welton, Thomas (2010). Solvents and solvent effects in organic chemistry (4th, edition.), Wiley-VCH, Weinheim p. 360. ISBN 9783527324736
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