Bog butters are large white or yellow waxy deposits regularly discovered within the peat bogs of Ireland and Scotland. They represent an extraordinary survival of prehistoric and later agricultural products, comprising the largest deposits of fat found anywhere in nature. Often found in wooden containers or wrapped in animal bladders, they are considered to have been buried intentionally by past farming communities. While previous analysis has determined that Irish bog butters derive from dairy fat, their precise characterisation could not be achieved due to chemical compositional alterations during burial in subsequent years. They generally produce a distinctive, pungent and offensive smell.
The largest Irish example weighed 23kg (50lbs) from a find in the Galtee Mountains in 1826. Bog Butter is primarily held in the National Museum with some held by local museums.
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