Dictionarium Polygraphicum. Containing. Polygraphick Dictionary. T. Tan. Tanner. Tanners Mill. Teints. To colour tin or copper of a gold colour.

Dictionarium Polygraphicum:
Or, The Whole Body of Arts Regularly Digested.
Vol II.
London: Printed for C. Hitch and C. Davis in Pater-noster Row, and S. Austen in St. Paul's Church Yard. MDCCXXXV.
1735
Tan, the bark of a young oak beaten small, and us'd by cur riers for the tanning or dressing of leather.

Tanner, one who dresses hides, &c. by tanning, so as to make leather of them: he uses much bark in the way of his employment, concerning which there are several terms.
1. Scutching the bark, which is the cleansing it from moss, and the rough crusty outward rind, with an instrument call'd a scutching-knise.
2. Hewing the bark, that is, chopping it into small pieces.
3. Grinding it, by putting it under the mill to grind it small.
4. Drying the bark, which is drying it, that it may grind.
5. Setting down.
6. Stretching.
7. Laying down.

Tanners Mill, an engine made use of by tanners for the grinding and crushing their bark; being a large, round, wooden trough, with a pretty big stone set on edge, or turning part, with sharp strong knives, leaded into the stone; which stone being turned in the trough, causes the irons to cut the bark very small.

Teints and semi-teints [in Painting, &c.] are the several colours us'd in a picture, considered as more or less high, or bright or deep, or thin or weakened, or diminish'd, &c. to give the proper relievo or softness, or distance, &c. of the several objects.

To colour tin or copper of a gold colour. Set linseed-oil on the fire, scum it well, and put in amber and hepatic aloes, of each a like quantity; stir them well together 'till it grows thick; then take it off, cover it close, and set it in the earth for three days: when you use it, strike the metal all over with it with a pencil-brush, let it dry, and it will be of a golden colour.