If PLUMS 3 ways with ISSUED BY THE MINISTRY OF FOOD (S204) This advertisement will appear in Mid-August Popular and Women's Weeklies, and September Monthly Magazines, 1948 1. The easiest way to battle plums No heating, no sterilising, no special bottles required, yet it's the sure-fire method with plums! Get some Campden preserving tablets from your chemist. Wash and drain the jars. Dissolve the tablets in cold or tepid water, allowing one tablet to each half pint. At least half a pint of solution must be used for each 1 lb.