Tannic acid (T)

Tannic acid is a substance for use in experiments for education, development, research and entertainment.

Use

Tannic acid is used in inks, a solution of which turns deep black with iron(II) sulphate (and other divalent iron compounds).

In addition, it is used to blacken iron and steel and also to protect it from oxidation. Before coloring black, the iron must be made clean and free of grease. Loose particles should be removed by brushing, sandblasting, sanding or other means. Then the object must be boiled in a solution of tannic acid. The longer it is cooked, the blacker it should be. There are different reports about the shelf life of this blackening. The black layer protects at least a little against rusting.

With cyanotype, tannic acid can be used to colour the prints dark gray to black. As the name implies, the substance can be used for tanning leather.

De Hekserij does not sell products intended for use in foodstuffs or for other internal use. This product is NOT an exception. Although certain qualities of tannic acid can be used in cosmetics, this quality is intended for technical use and therefore not suitable for cosmetics.

Keep cool, dry, dark and out of reach of children.

Properties

Tannic acid is a natural product. It consists of a number of gallic acid molecules linked together in a framework. For this reason, tannic acid always partly consist of gallic acid in addition to various often unknown contaminants that occur in the starting materials (oak galls, oak leaves, oak bark and the like). Tannic acid largely dissolves in water and also in alcohol, albeit less well.

The substance attracts water and is therefore sometimes used as a humectant in blowing bubble solutions.

The color varies as is common for many natural materials. In general we supply a dark beige product, but occasionally it may be lighter or darker. It depends on the material we receive, it is not a matter of choise.

Packaging

Tannic acid is packed in square plastic (PE) jars with a red screw cap.

Dangers

Tannic acid has not been classified as a hazardous substance by our supplier. We have chosen to do this ourselves, as follows:

WARNING
H319 - Causes serious eye irritation.

Codes

Item number: 32021
Dutch name: Looizuur
EC number: 215-753-2
CAS Number EU: 1401-55-4
CAS Number TSCA: 1401-55-4