Why do you think most places quote Eckhart 5413-H as 3 micron when Eckhart list it as less than 45 micron?
My guess is,, how is the aveage joe going to know what micron it is ? plus its saleability is increased with a finer grade,,
and technicaly < 45 microns can be anywhere between 1---> 44 microns, so misrepresenting their product is possible,and not illegal,
the indian blackhead i buy is marketed at 4--->5 micron, i have no idea what it is therefore have to trust the supplier, whatever it is i am more than happy with it, ( 3 grams open on a flat test plate is unbelievably fast ) if i had to guess its speed.... a fraction of a nano second", you can feel through sound an almost det-nation, i have used, 5 grams and 10 grams as burst charges and the star projection is fantastic, although my glitter stars work great it seems to blow my colored stars blind, ( need to work on a prime , any advice would be welcomed ) i did do a thunder burst by mixing 10 gram lots of 70:30 x 40 grams in a 2.5" can shell on a 3 lb rocket and it was exactly that, " thunder" with my own made kclo4 and puchased indian black....
i must also say i am terrified when ever i mix it and don't do it as much as i thought i would, ( sort of a been there done that, know what can happen and don't really want to use it much anymore, But still do )
i can't emphasise enough the advice given here by others on the dangers of flash is invaluable, "" Curious new comers take heed !!
if this stuff doesn't kill you in an accident it will blow your body parts off !