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David Sager asked about washing shellac.

We sometimes wash shellac in tepid water using Kodak Photoflo.  The dilution
is dilute, a couple of drops in 500ml and is there as a wetting agent rather
than a 'bubbly detergent'.  Having first pre-washed the disc under a running
tap (a faucet will do!) we use a wet soft nylon brush to clean the disc in a
concentric motion 'with the grooves' using the Photoflo water.  Fingers work
well too but the brush will get into the groove.  The vitally important last
step is to rinse the disc most thoroughly with distilled water to remove all
traces of tap water so as to prevent depositing lime scale.  No harmful
effects on shellac to date, but be careful of the label.

Beware of discs with a cardboard etc core.  They don't like water (or rather
they do because they'll just absorb it like a sponge - very bad!).

Nigel
British Library National Sound Archive


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