ities; set them on a fire, and when the vinegar is boiled,
till it becomes one-fourth part of its original quantity, throw into
it the metal you design to gild, and it will assume a copper colour.
Continue boiling it, and it will change into a fine gold colour.

_A Water which gives Silver a Gold Colour._

Take sulphur and nitre, of each an equal quantity; grind them together
very fine, and put them into an unglazed vessel; cover and lute it
well; then set it over a slow fire for 24 hours; put what remains into
a strong crucible, and let it dissolve; put it into a phial, and
whatever silver you anoint with it will have a gold colour.

_To make an old Gold Chain appear like new._

Dissolve sal ammoniac in urine, boil the chain in it, and it will have
a fine gold colour.

_To give Silver the Colour of Gold._

Dissolve in common aqua fortis as much silver as you please. To eight
ounces of silver, take four ounces of hepatic aloes, six ounces of
turmeric, and two ounces of prepared tutty, that has been several
times quenched in urine. Put these to the solution of the silver; they
will dissolve, but rise up in the glass like a sponge; this glass must
therefore be large, to prevent running over. Then draw it off, and you
will have ten ounces of silver as yellow as gold.

_A Water to give any Metal a Gold Colour._

Take fine sulphur and pulverize it; then boil some stale spring water;
pour it hot upon the powder, and stir it well together; boil it again,
and pour into it an ounce of dragon's blood. After it is well boiled,
take it off, and filter it through a fine cloth; pour this water into
a matrass, (a chemical vessel,) after you have put in what you design
to colour; close it well, and boil it a third time, and the metal will
be a fine gold colour.

_Another way._

Take hepatic aloes, nitre, and Roman vitriol, of each equal
quantities; and distil them with water, in an alembic, till all the
spirits are extracted; it will at last yield a yellowish water, which
will tinge any sort of metal of a gold colour.

_To give Silver-plate a Lustre._

Dissolve alum in a strong ley, and scum it carefully; then mix it up
with soap, and wash your silver utensils with it, using a linen rag.

_The Fiery Fountain._

If twenty grains of phosphorus, cut very small, and mixed with forty
grains of powder of zinc, be put into four drachms of water, and two
drachms of concentrated sulphuric acid be added thereto, bu