G*K Posted October 31, 2006 Share Posted October 31, 2006 I was wwondering what compostion is used for a dark stage star. I have seen "Purple dark purple" peonies that break like a purple peony, then appear to go out for maybe 0.5 second, then turn back on. The composition really is pretty dark, like a high quality strobe. but it isn't a single comp (very slow strobe) because there are red-dark-green shells. Beyond the comp how is the mechanics affected i.e. is duration of the dark stage a fuction of the thickness of the 'dark' comp, or, of the formula of the comp.... Apologies if this subject has been covered ...I looked Thanks G*K Link to comment Share on other sites More sharing options...
Mumbles Posted October 31, 2006 Share Posted October 31, 2006 Changing Relay #1Source: Shimizu[1], page 187Comments: This type of composition is put between two color layers in a star to create the illusion that all the stars change their color clearly and simultaneously in spite of slight deviations in manufacture.Preparation: Potassium perchlorate.............................35Potassium nitrate.................................35Hemp coal (or Paulownia coal).....................24Soluble glutinous rice starch.....................6 Changing Relay #2Source: Shimizu[1], page 187Comments: This type of composition is put between two color layers in a star to create the illusion that all the stars change their color clearly and simultaneously in spite of slight deviations in manufacture.Preparation: Potassium perchlorate.............................81Red gum...........................................13Soluble glutinous rice starch.....................6 Shimizu Dark Relay Potassium Nitrate 75 Charcoal Airfloat 8 Potassium Perchlorate 7 Antimony Trisulfide, Chinese needle 3 Red Gum 2 Total: 95 SGRS can be replaced by dextrin if you want. The hemp or paulownia coal is charcoal. The first two also double as primes, while the second one is not specifically listed as a prime though. No idea about the burn speed. 1 Link to comment Share on other sites More sharing options...
Mardec Posted October 31, 2006 Share Posted October 31, 2006 So only the thirth one is completly dark? The first 2 are just lighter? And soluble glutinous rice starch, is it the same as rice starch?I know I can use dextrin, but I was just wandering, I can buy rice starch right of the shelfs. Would same me 2 hours making dextrin every time Link to comment Share on other sites More sharing options...
ravaz Posted October 31, 2006 Share Posted October 31, 2006 The first one is dark. I've used this in double petal shells where the outer petal comes on late. I never really noticed a tail or trace of those stars in the air, it's pretty dark. I use the second one for color changing stars. The third one works pretty well but I have noticed a slight tail from them. It's very dim but it's there. Link to comment Share on other sites More sharing options...
Mumbles Posted October 31, 2006 Share Posted October 31, 2006 No, rice starch is not the same as soluble glutinous rice starch, and they are not interchangable. I've personally never tried any of them. From what I gather is that they will all work. They won't actually burn completly dark on the ground. I've heard it's just like a smouldering red, or a very weak flame. The first two may be faster burning, like just a quick lapse in color to give an illusion of closer color change symetry. Link to comment Share on other sites More sharing options...
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