F.P. flash bulb/lights

[Telecolor 3007]

There where some type of flashbulbs that allowed some cameras that have slow sync flash speed to use sync speeds up to 1/500 or 1/1000 seconds. How can you make the difference between an standard Magensium bulb and F.P. one.

 

[old_tv_nut]

They will have "FP" in the type number, like "26 FP." This would be marked on the package. I don't recall for sure if the individual bulbs were marked with the type, but I think they may have been.