This was produced by using a black velvet for the background.

The plate was exposed sufficient time to produce one impression, and then the gentleman assumed another position, and is repeated as looking at himself.

From the fact that the time required to develop black velvet being so much longer than that for producing a portrait, we are enabled to produce the above interesting results.
DEPOSIT IN GILDING.
Regarding specks from bad water, I would remark that gilding should be made only with distilled water.

Thus made, it produces very little deposit, even by long keeping.

It therefore preserves its original strength, and works with great uniformity.
Every grain of deposit contains at least 7-10 its weight of gold, easily discoverable by the blowpipe.