valonea ( vallonea, valonia )
A vegetable tanning material obtained from the
dried acorn cups and beards of the Mediterranean
(valonea) oak, Quercus aegilops, and allied
species. The cups contain tannin in the amount of
25 to 31%, while the beards usually contain 40% or
more. Valonea is of the pyrogallol class of
tannins and produces a leather of firm texture and
light color. It also deposits considerable bloom
because of its relatively high content of
ellagitannic acid. It has a fairly high natural pH
(3.6) for a pyrogallol tannin, as well as a
moderately high acid and salts contents. See also:
VEGETABLE TANNINS
. (175 , 306 )
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