If the surface of the wood is moistened with water just before exposure, it turns darker than if exposed dry.

The stain penetrates so deeply that it may be sandpapered after the exposure without harm.

After fuming and sandpapering the surface should be oiled to prevent finger marks.
Dark brown for chestnut, or oak, or mahogany.

This is obtained with a solution of acetate of iron, made as follows: digest one part by measure of iron dust in 8 parts of glacial acetic acid.

After the chemical action is well started, add several times as much water to keep the mixture liquid.