Sodium silicate is the common name for compounds with the formula Na2(SiO2)nO. A well-known member of this series is sodium metasilicate, Na2SiO3. Also known as waterglass or liquid glass, these materials are available in aqueous solution and in solid form. The pure compositions are colourless or white, but commercial samples are often greenish or blue owing to the presence of iron-containing impurities.
They are used in cements, passive fire protection, textile and lumber processing, refractories, and automobiles. Wikipedia, Sodium Silicate
To Seal Eggs
The ratio is one ounce (by weight) of lime (calcium hydroxide) to one quart of water. Calcium hydroxide is a completely natural, organic ingredient and harmless, although the powder is very fine and may irritate your lungs if you breathe it in. The lime water also quickly dried out the skin on my hands
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