Maybe he's using Chromium(III) Oxide? That's green.
On Thu, Aug 23, 2018 at 10:50 AM Harry Amadeo <harryamadeo@xxxxxxxxx> wrote:
Wait a minute,
Charlie, where were you getting green copper chromite? I use copper
chromite in my propellant, but the stuff I get is all black (from RCS).
Cheers,
Harry.
On Thu, Aug 23, 2018 at 12:01 PM Terry McCreary <tmccreary@xxxxxxxxxxxxxxx>
wrote:
One other issue...avoid dyes that have reactive hydroxyl groups. A long
time ago I discovered that methyl salicylate (oil of wintergreen) could not
be used to make propellant smell pleasant, as it didn't play well with
isocyanates... the phenolic hydroxyl group was the culprit.
On 8/22/2018 8:06 PM, Charlie Garcia wrote:
The purpose of coloring them is primarily aesthetic. Our old propellant
was a delightful shade of green from the copper chromite. Dying the new
ones will make them easy to distinguish ( not that that's necessary) and
fun.
Other than staying away from TMO's and chemicals ending in -cene, are
there any other dye chemistries that are likely to significantly change the
burn rate.
Thanks for the suggestions. We'll report back if we discover one that
works.
Sincerely,
Charlie
On Wed, Aug 22, 2018, 4:19 PM Terry McCreary <tmccreary@xxxxxxxxxxxxxxx>
wrote:
I've not done so, but the organic---no metallic elements and no--
minerals---dyes used to make smoke bombs or dry organic pigments used to
make oil paint might be worth trying, as they are unlikely to affect
ballistic characteristics significantly in small quantities. You'd need
to know the actual formula or composition of the dye; for example,
viridian pigment is a form of chromium oxide and would increase the burn
rate.
Best -- Terry
On 8/22/2018 12:48 PM, Charlie Garcia wrote:
Hi All,
Does anyone here deliberately dye their grains, like AeroTech or CTI?
In particular I'm looking for a red dye, preferably in very small
fraction or a liquid. I've had the red dye that comes in RocketPoxy
suggested to me. Thoughts?
Sincerely,
Charlie
--
Dr. Terry McCreary
Professor Emeritus
Murray State University
Murray KY 42071
Dr. Terry McCreary
Professor Emeritus
Murray State University
Murray KY 42071
--
So long and thanks for all the fish.