where the preservative cation source is a hydroxide, the percentage of dry ingredients in the produce preservative is preferably from 50% t0 95%, more preferably from 55% to 90%, more preferably from 60% to 92%, more preferably from 70% to 85%, ascorbic acid or erythorbic acid and from 5% to 50%, more preferably from 8% to 40%, more preferably from 15% to 40%, preferably salt.