1. Aquafortis 1/2 oz., sweet spirit of nitre 1/2 oz., spirit of wine

1 oz., sulphate of copper 2 oz., water 30 oz., tincture of perchloride of iron 1 oz.: mix.

2. Sulphate of copper 1 oz., sweet spirit of nitre 1 oz., water a pint; mix. In a few days it will be fit for use.

3. Sweet spirit of nitre 3 oz., gum benzoin 1 1/2 oz., tincture of perchloride of iron 1/2 oz., sulphate of copper

2 drs., spirit of wine 1/2 oz., mix, and add 2 lbs. of soft water.

4. Tincture of perchloride of iron 1/2 oz., spirit of nitric ether 1/2 oz., sulphate of copper 2 scruples, rain water 1/2 pint. The above are applied with a sponge, after cleaning the barrel with lime and water. When dry, they are polished with a stiff brush or iron scratch brush.