In deze tekst die ik op het net gevonden heb wordt er ook gesproken over het gebruik van lijnzaadolie in verband met het onderhoud van leder. Het gaat niet over schoenzolen maar over lederen plectra voor gitaren. Verder staat er ook in waarom ze geen andere olie gebruiken in verband met zuurtegraad. Of dit ook geldt voor schoenzolen is natuurlijk de vraag.
The durability depends on the feather’s elasticity.
Cowhide was easily to get , but as it was quite soft
people used it mainly for the “peau de bouffle” - a
gentle register which imitates the finger tips of the
lute player.
Leather plectra have got a smooth side which should
be on top while inserting. After it is inserted and cut
on length, the bottom has to be cut as thinn until a
pleasant tone arises. Instruments from 1900 to 1980
with leather plectra have got quills wich are treated
with linseed oil to make the leather harder and to
hold it elastic. The drying time depends on the
silicate additives and is a lengthy process. Our cut
leather plectra in three different width, have to be fit
in by yourself (no. 12-3358, 12-1137, 12-3359).
As natural procucts feathers and leather need care,
which the animals managed by theirself during their
lifetime: one has to grease them, so that they do not
become brittle and fragile. The oils which are used
for the care are neither allowed to resined nor to
attack the strings with their acid. Therefore oils of
sunflower, olive, rape and nut are not suited. Our
quill oil (no. 55-2816) meets to these demands: it
soaks in the quill and keeps it elastic.