Ah yes...
...the memories trickle back.

If you take iodine crystals and mix them with anhydrous ammonia, you get a brownish liquid. If you paint this on a surface and let it dry, it becomes very unstable and detonates at a very slight touch. Being an iodine compound, it turns things in the immediate vicinity brownish-purple.

If you paint it on the undersides of the toilet seats in the girls' bathrooms, it generates screams and purple thighs.

Not that I would know this from personal experience, of course...
( The Resident Loon Not a demographic. Do not measure., Thu 29 Jan 2009, 15:59, 4 replies)

I know of something else that will also generate screams and purple marks on girl's thighs.
But I'n not telling : )
( girlinthehole, Thu 29 Jan 2009, 16:06, closed)

is it
Potassium Permangulate and Glycerine?
(jordanchaos isn’t just any PeaRoast, this is a M&S PeaRoast, Thu 29 Jan 2009, 16:09, closed)

Hmmmm...
*looks at hands*

*contemplates English schoolgirl pr0n with the stern Headmaster*

*imagines handprints*

*risks getting fired for contemplating such things on the job*

That's okay, I'm not sure that I should be discussing this now anyway...
( The Resident Loon Not a demographic. Do not measure., Thu 29 Jan 2009, 16:25, closed)

However
You must remember that any you make in a pot the week before, should NOT be scraped out to make room for more.
Fortunately I wasn't in the shed at the time.
(Kliper Filllets Getting noticed by twats on the internet since, Thu 29 Jan 2009, 17:07, closed)