When, however, another suggestion is followed - similar feeding through the leaves by spraying with iron sulphate - extreme care must be exercised.

Using iron sulphate and potash to create cochineal red lake, he used potash that was mixed with animal oil.

It was expected that the iron sulphate would distribute through the upper 15 m of the water layer and trigger algal bloom.

Some pails were supplied with deodorants such as iron sulphate.

Yellowing of new leaves may indicate chlorosis from iron deficiency and can be remedied with iron chelate or iron sulphate.

One ounce of vitriol (iron sulphate)

Essentially, they were an iron supplement, containing mostly sugar, starch and an iron sulphate.

In the presence of iron, one of the sulphates produced will be iron sulphate which is soluble enough to be available to plants.

Iron can be made available immediately to the plant by the use of iron sulphate or iron chelate compounds.

Other substances reputed to have been used by the English include Spanish fly, opium, watercress seed, iron sulphate, and iron chloride.