Can anyone suggest me a dye which does not stain PDMS?

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Amit Morarka

hi,

Most of the time rhodamine 6g and methylene blue (these were the only two dyes we had) will stain pdms easily and it will take a reasonable time to de-stain it completely. What we used for the same task was simply a aqueous based ink which is used in ink-pens. Blue, red and black they gave good results without any stain. We checked using Ocean optic spectrometer whether the pdms was stained with these or not. They did not stain it.

Regards

Amit