Tyr this for pre-surgical marking, it should be available from the 
hospital pharmacy:

Gentian violet (crystal violet, Methyl Violet 10B, hexamethyl 
pararosaniline chloride) is an antifungal agent, the primary agent used 
in the Gram stain test, perhaps the single most important bacterial 
identification test in use today, and it is also used by hospitals for the 
treatment of serious heat burns and other injuries to the skin and 
gums. Typically prepared as a weak (e.g. 1%) solution in water, it is 
painted on skin or gums to treat or prevent fungal infections. Gentian 
violet does not require a doctor's prescription (in the US), but is not 
easily found in drug stores. Tampons treated with gentian violet are 
sometimes used for vaginal applications.

Gentian violet is also known as Andergon, Aniline violet, Axuris, Badil, 
Basic Violet 3, Brilliant Violet 58, Gentiaverm, Hexamethyl-p-rosaniline 
chloride, Meroxylan, Meroxyl, Methylrosalinide chloride, Methyl Violet 
10BNS, Pyoktanin, Vianin, Viocid, and Viola Crystallina. It is worth 
noting that the name 'Gentian Violet' refers to its colour being like that 
of a gentian; it is not made from gentians.

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