The Fourth Chequered Background
This is the fourth checkered background; outline
it and gild it like you made the previous background, and paint it with
simple blue and dark red, and cross it through with black; and make
white and red dots into the blue, and into the red, white or red dots,
as is shown here.
Take one ounce of tin, which is well purified, and
place it into a goldsmith's melting pot and let it melt well over coals;
and then take one ounce of quicksilver, which is also purified, and
pour the quicksilver into the melted tin over the fire and then stir
it together with a wire or stylus, and then take it off the fire and
let it grow cold, and after that grind it on a grindstone very fine
and then wash it in pure water, until it flows readily. After that,
take it and spread it out in the sun on a board or on a paper or whatever
you like. If it is not cold, let it dry real well. After that take one
ounce of sal ammoniac and one ounce of live sulphur, the same amount.
These you also grind together, but not with the tin and the quicksilver.
Thus you have together four ounces, two ounces the tin and quicksilver
together, and then once again two ounces together, namely the sal ammoniac
and the live sulphur. Then take a scale and weigh the first two ounces
of tin and quicksilver. Then if it correctly makes two ounces, take
the other two ounces of sal ammoniac and live sulphur, that it too makes
two ounces. Everything together, tin, quicksilver, sal ammoniac, and
live sulphur, that makes together four ounces. Then take a glass which
is called little nun, which should be large. The glass you cover with
pure glue, with horse manure, and with well-beaten salt; put that
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