How to convert Zinc Sulfate Monohydrate (ZnSO4.H2O) to Zinc Sulphate Heptahydrate (ZnSO4.7H2O). Please understand it is not as "simple" as mixing Zinc Sulfate Monohydrste it with excess water and boiling it up to 1500 gravity and then waiting for it to crystalize as zinc Sulfate Heptahydrate.