crayola marker for autoradiograph

[Woong Choi, M.D.]

Dear Netters:

In this newsgroup, there might be an article about a flurorescent
crayola (originally for children) which can be used as a marker for
autoradiograph. I tried to buy a fluorescent crayola in Korea and in
U.K. without any success.

I would greatly appreciate if anybody could tell me where and how I can
get this fluorescent cryola.

Thanks.