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I should elaborate a bit more here. In his book on the Taipa firecracker trade, Dr. Lai mentioned 'flashpowder fuses' when describing the addition of potassium dichromate to make fuses faster...

All I wanted to add is that today’s firecrackers are not braided. The crackers have short (<?") fuses bent and held parallel to a piece of fishfuse (like visco, but burns much faster and brighter...

I didn't quite finish in under 8 minutes. Hopefully administrator will post full reply.

Lefti all Chinese firecrackers used fuses made with black powder. And no, they never tried to slow down by any means. In fact one of the main selling points of the premium brands was 'fast lead...

Chinese firecracker fuse has never been made with flash powder. A small amount of potassium dichromate was added at one time in the '50's, according to Dr. Lai's book, but I don't know the reason...

Have some 1-1/2" BC crackers from early DOT era (1972-76) that came loose in boxes of 50.