LEAD NITRATE DEPOSITION (Caution: many chemicals may be dangerous. Read all instructions and safety information supplied by manufacturers)
The deposition of lead on glass is just as easy, if not simpler, than standard silver mirroring. Because of its darkened appearance, any otherwise noticeable blemishes are hard to distinguish.
These instructions are for those persons already versed in normal silvering procedures and taking for granted you are set up to produce standard mirrors.
CONTENTS OF SET AND MIXING FORMULA
The three parts of this set are as follows:
THIOUREA; 60 gm to be mixed and shaken well with one quart of distilled water.
SODIUM HYDROXIDE; 120 gm to be mixed and shaken well with one quart of distilled water.
LEAD NITRATE; 40 gm to be mixed and shaken well with one quart distilled water.
As you have noticed this is much like setting up silvering chemicals with the only difference being the use of dry concentrates. They will dissolve rapidly with distilled water and occasional shaking. The shelf life is indefinite.
Clean and tin your glass as normal. Now take a small portion of your diluted “GREEN” silvering solution as a sensitizer, pour onto your panel, swill around and let it sit for a minute or so. This not only helps in deposition, but also gives a slight blue cast to your mirror.
Rinse thoroughly and apply your lead solution made up of one ounce of each of the three counterparts for each square foot of glass. The deposition time is a little slower than silver but will be noticeable in a few minutes.
As an example: A one square foot panel would require one ounce each of diluted Lead Nitrate, Thiourea and Sodium Hydroxide. No particular order or caution is necessary in mixing. Simple boxing and application will suffice.
After an acceptable layer has developed, rinse well and treat as a normal mirror. Unwanted deposits may be removed after backup with silver strip or muriatic acid.
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