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The recipe for silvering the speculum is:
Solution A:
Distilled water.............................4 oz.
Silver nitrate............................100 gr.
Solution B:
Distilled water.............................4 oz.
Caustic stick potash (pure by alcohol)....100 gr.
Solution C:
Aqua Ammonia.
Solution D:
Sugar loaf................................840 gr.
Nitric acid................................39 gr.
Alcohol (Pure).............................25 gr.
Mix solution D and make up to 25 fluid oz. with distilled water,
pour into a bottle and carefully put away in a safe place for
future use, as it works better when old:
Now take solution A and set aside in a small bottle one-tenth of
it, and pour the rest into the empty dish; add the ammonia
solution drop by drop; a dark brown precipitate will form and
subside; stop adding ammonia solution as soon as the bath clears.
Then add solution B, then ammonia until bath is clear. Now add
enough of the solution A, that was set aside, to bring the bath to
a warm saffron color without destroying its transparency.


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