This method was used to silver plate chapter rings on long case and bracket clocks. Chemical amalgamation used for silver plating is described in ‘The Laboratory or School of Arts’ London 1740 as:

1. Take calx (powder form) of fine silver half an ounce
2. One ounce of sal-ammoniac,
3. Three ounce of salt,
4. Mix and grind these together,
5. When you use it, grind and temper it together with water and rub brass therewith,
6. Anneal it brown and then quench it in water, wherein tatar has been dissolved, then scratch it,
7. Finish your work by polishing it.