These strobe pot formulas were lifted from the PML and used with the author's permissions. Some of the ingredients may not be available to everyone, but it’s a worthwhile project anyway.

All parts listed are by weight and do not necessarily add up to 100.

Ammonium perchlorate	60
Magnesium, atomized, -100 + 200 mesh, coated with potassium dichromate	30
Potassium sulfate	10
Potassium dichromate, milled dust	additional 2-3%

Ammonium perchlorate	60
Magnalium (magnesium-aluminum alloy) -60 mesh, coated with potassium dichromate	25
Barium sulfate	7.5
Strontium sulfate	7.5
Potassium dichromate, milled dust	additional 3-4%

The blend of sulfates gives a nice clean white with no greenish cast. (For a nice star substitute 10% of the 60 mesh Mg/Al with -200 mesh. Adding a tiny bit of medium mesh titanium makes a fun star.)

For strobe pots, dampen lightly with nitrocellulose solution and tap or press into a thin wall tube with a wood or aluminum rod. Prime as is normal for ammonium perchlorate mixes.

To learn more about strobe fireworks read these:

"Blue Strobe Rockets"
"White Strobe Rockets"