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.

Thanks,

Wes