we have done it.
we did what severial pyrotechnitions told us could not be done.
we designed a smoke grenade that is ignited by pull string and does so without the use of a prime composition or pyrogen.
you can ignite these color smoke grenades in the dark and not see any flame or sparks.
you can throw them lit into a pile of dry hay and they wont start a fire.
need proof email me at bow77666@yahoo.com