I'm afraid this one went unanswered in the milling media thread, so
I'm taking the extraordinary step of copying:
On Apr 13, 11:06 am, LadyKate <ladyk...@[EMAIL PROTECTED]
> wrote:
> Myself, and for BP, I use hard copper coated lead. I do not mill
> anything but BP with that media. The copper can contaminate also -
> especially chlorates - so it is relegated to BP.
I'd like to re-open the issue of the danger of mixtures of KClO3 with
Cu metal. On the one hand we've had the WiZ pass along results of
experiments to determine whether mere contact with Cu or bronze
sensitized KClO3 comps enough to explain certain accidental mine
explosions -- although it wasn't clear whether the "coal dust" used in
the comps was sulfur-bearing. On the other, John Reilly wrote:
"When Pyrotechnica VI came out, I tried several of the blue and purple
mixes ****mizu listed but none with metallic Cu. I will have to pull
that out again and see what happens, substituting KCLO3 and trying
part or all Saran. If this will provide a high burn rate and still
provide a good color it will be very worthwhile. Looks like I need to
pick up some more copper powder."
That was a few years ago, and I don't know how that came out, although
we see John is still with us! I too would like to try blues with
KClO3 and Cu metal powder, but not if the mixture in the absence of S
is expected to be sensitive beyond the usual range of star & lance
comps.
BTW, KClO4 blues with Cu metal are good and fairly bright.
Robert
|
