In article , Wes
wrote:

I just finished reading the "bullseye mixture" in the 2nd Machinists Bedside
Reader and am interested in trying the color case hardening formula
described.

It seems the author got a bit of cold feet later on about the use of barium
sulfate.

So the question is how dangerous is trying the method? What should one do
to minimise risk? I see Skylighter has it at reasonable prices.

Barium sulphate isn't poisonous, but the water-soluable barium salts
are quite poisonous.

http://gsm.herston.uq.edu.au/radiolo...Agents/Contras
t.html

Joe Gwinn