Sparx88 Posted January 21, 2015 Posted January 21, 2015 Ok, which is a better yellow, a bright rich intense yellow, not the kind of yellow you get from BP; Sodium NitrateSodium Oxalate?
Carbon796 Posted January 21, 2015 Posted January 21, 2015 That's going to be more a result of the formula, than the color donner.
GalFisk Posted January 21, 2015 Posted January 21, 2015 Sodium is intense by default. The more heat you put in, the more light you get out - use a metal fuel for the most light. I'd recommend using the oxalate in most situations simply because it's less hygroscopic than the nitrate (critical relative humidity of 90-something vs 70-something percent), and you don't get the nitrate-metal incompatibility if you use a perchlorate oxidizer. Notice that oxalate is toxic though, while the nitrate is relatively harmless in that regard.
Mia Posted January 21, 2015 Posted January 21, 2015 Found this if it is of any use the yellow is outstanding http://pyro-gear.co.uk/forum/viewtopic.php?f=15&t=55
Mumbles Posted January 21, 2015 Posted January 21, 2015 For yellows I actually prefer optical colors. I've grown to find sodium yellows to be undesirable, so I go with other hues personally. A good starting point is blending compatible green and red formulas 61:39 if you want to explore this route. As far as sodium based colorants, my personal favorite is cryolite. It's non-hygroscopic unlike sodium nitrate, and it's non-basic unlike sodium oxalate. Additionally sodium oxalate is relatively expensive compared to most other sodium sources, and I prefer to save it for glitters.
Pirotex Posted January 21, 2015 Posted January 21, 2015 (edited) Sunrise yellow:NaNO3 - 55% Magnalium - 25% S -10% Charcoal (airfloat) - 5% Dextrin - 5%VIDEO: https://www.youtube.com/watch?v=QIY3sfNq7R0VIDEO2: https://www.youtube.com/watch?v=BP_YMSAnI24 Acid yellow:Ba(NO3)2 - 54%SrCO3 - 5%Mg - 19%Cryolite - 14%Phenolic resin - 8%VIDEO: https://www.youtube.com/watch?v=uAsnKAOBxNY Edited January 21, 2015 by Pirotex 1
Zumber Posted January 22, 2015 Posted January 22, 2015 Sunrise yellow:NaNO3 - 55% Magnalium - 25% S -10% Charcoal (airfloat) - 5% Dextrin[/size] -[/size] 5%VIDEO: VIDEO2: Acid yellow:Ba(NO3)2 - 54%SrCO3 - 5%Mg - 19%Cryolite - 14%Phenolic resin - 8%VIDEO: Sunrise Yellow looks pretty...what is mesh size of magnelium in composition of sunrise yellow?
Sparx88 Posted January 22, 2015 Author Posted January 22, 2015 I'm liking the cryolite performance. I see that in quite a few comps but did'nt have a chance to see it in action with quality work until now. Thank you for the leads and vids. The yellow in Mia's vid is what I'm after. Then with sunrise yellow being a tad orange but still using cryolite I can back off the bano3 and "srno32" to start with. I will try what you said mums today er tonight with the red and green mix.
Mia Posted January 22, 2015 Posted January 22, 2015 (edited) If you look around the site you will see a new blue formula if you roll yellow cores to around 8mm then roll over the blue you get an interesting effect: 15mm id whistle 3inch shell https://www.youtube.com/watch?v=3BzVoZbdGto the camera on the phoneWhitened the yellow but it was there Edited January 22, 2015 by Mia
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