Materials
Morta (Bog Oak)
Morta is semi-fossilized oak wood that has lain buried in a peat bog or riverbed for thousands of years without oxygen; a pipe bowl material known for its neutrality of taste and high resistance to burning.
Morta is oak wood at the earliest stage of fossilization, having lain buried in a peat bog or riverbed for thousands of years in an oxygen-free environment. It is also known as bog oak; in the Balkans it is called "abonos." Sources give varying ranges for how long it stays buried; typically wood aged between 2,000 and 6,000 years is cited. Alongside briar and meerschaum, it is a rare but well-regarded pipe bowl material thanks to its distinctive qualities.
Formation and Properties
The bog's acidic, oxygen-free environment protects the buried trunk from decay. During this long wait, the oak's tannins react with iron minerals in the water and the wood gradually darkens; black is the best-known color, though morta blocks in copper and gold tones also occur. This natural "leaching," spanning thousands of years, largely removes tannin, resin, and similar substances from the wood. For this reason morta is considered fully neutral in taste; the woody flavors briar can add to a smoke are absent in morta.
According to manufacturer data, mineral content that can exceed ten percent makes the bowl extraordinarily resistant to burning. Its porous, low-density structure absorbs moisture and condensation very well, which is why morta pipes are generally lightweight.
Working and Manufacturing
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Source: Pipedia, adapted under the CC BY-SA licence.