GBC

Density, Strength & Purity

Historical measurements for alcohol strength, precious metal purity, and brewing density.

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🧪 Density, Strength & Purity

Historical measurements for alcohol strength, precious metal purity, and brewing density.

Density, Strength & Purity

Carat / Fineness

A metric used by the Royal Mint and goldsmiths to measure the purity of precious metals.

925 parts per thousand (sterling silver standard)

Density, Strength & Purity

Gravity

Used by British brewers to measure how dense unfermented beer was compared to pure water.

Specific gravity measurement

Density, Strength & Purity

Proof

Traditional spirit strength verified by whether gunpowder soaked in alcohol would ignite.

57.1% ABV (at 100° UK Proof)

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