Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: Raymond Duray who wrote (19993)	2/25/2002 7:48:14 PM
From: Ilaine	Read Replies (1) \| Respond to of 281500

When I worked in photolithography, I used to use a solution of potassium ferrocyanide and hypo (called "Farmer's reducer") to reduce (thin) the surface of negatives that were too dense. It used to be easy to obtain from a photo supply shop. Kept it sitting around in a plastic bottle and poured it out onto a cotton swab held with a forceps to wipe the surface of the negative to try to make it lighter, or submerged the negative briefly in a small tray full. Not very dangerous but one did not touch it, preferably. It's also used for making cyanotypes, which are blue and white rather than black and white because they don't use silver (which oxidizes black). Looks like a blue print, sort of. I think you can release cyanide gas from it using heat or acid if you're so inclined. Rather risky business, that. Not sure how you'd direct it towards someone else's direction. The Nazis used to put their victims in a sealed room, and they were using cans of hydrogen cyanide gas (Zyklon B).