in German documents about the raid against Dusseldorf the information can be found that canisters with phophorus solution has been dropped by the RAF. There are sources in which is said that these canisters have not been used by Bomber Command later than the beginning of 1942 and that the German population thought that the remains of the 30 lb incendiary bombs would be those canisters.

Does anybody know how long Bomber Command used this canisters?