What we use (after countless attempts at using castaloni paint, "pens
made excusively for mapping" etc) are "marks-a-lot" permanent markers.
available at wal-mart etc. they are extremely inexpensive and from what
my surgeons tell me, are more visible on the skin at prep time than what
we used to use! incidentally, they come in Jumbo size, about the
diameter of a banana :) which makes single application coverage a cinch.
for what its worth................
Doug Marcum RT(R), RDMS, RVT
Maitland (Orlando), Fl.
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