How To Make Silvering Solution In Silvering Glass
Silvering Glass
.
In all cases where it is intended to deposit a silver mirror on a glass surface, thorough cleaning is essential. Prolonged soaking in a hot solution of potassium bichromate which has been acidified with sulphuric acid will often prove useful.
The glass should then be washed thoroughly, rinsed in distilled water, and the solution should then be used.
Formulae for the silvering solution :
A—Nitrate of Silver 40 grammes
Distilled Water 1000 c. cm.
B—Nitrate of Ammonium 60 grammes
Distilled Water 1000 c. cm.
C—Pure Caustic Potash 100 grammes
Distilled Water 1000 c. cm.
D—Pure Sugar Candy 100 grammes
Distilled Water 1000 c. cm.
Dissolve and add:
—
Tartaric Acid 23 grammes
Boil for ten minutes, and when cool add:
—
Alcohol 200 c. cm.
Distilled Water to 2000 c. cm.
For use :
- Take equal parts of A and B.
- Mix together also equal parts of C and D in another vessel.
- Then mix both liquids together in the silvering vessel and suspend the glass to be silvered face downwards in the solution. Or if a vessel has to be silvered on the inside, the solution is poured in.
- In this case, the deposition of silver may be hastened by immersing the vessel to be silvered in warm water.
In working with a silver solution containing ammonia or ammonium salts there is sometimes the possibility of forming an explosive silver compound.
It is well, therefore, to avoid keeping such solutions longer than is necessary, and to bear in mind that any deposit formed by solutions containing both silver and ammonia may have explosive properties, especially when dry.
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