mercurochrome replacement

Since the production of  mercurochrome is no longer available.  We have
cleaned out all the backwoods pharmacy in these hills.  Does anyone have a
procedure for marking prostate needles and other small biopsies.  We have
the powder.  Anyone know of what % soultion aqueous ?  alcoholic?
We tried using margin ink.  It just doesn't have the same effect.  Thanks
in advance for any suggestions.

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