Sulphur Powder is the coarser grade and is useful for making soil slightly acidic that is applied at the usual gardener's rate and one handful per square meter and sprinkled over the soil and raked in. It contains sulphur as an active ingredient that works by inhibiting the growth of fungus, parasites, and bacteria. Sulphur Powder is one of the oldest remedies for gardens and human ailments that occurs naturally as a pure element in the form of a yellow powder and as crystals.