by dotfret »
Wed Feb 06, 2008 12:50 am
There's a lot I agree with here - and a lot I do not agree with.
Peroxide will attack the shellac. Likewise, bleach will attack shellac - it typically contains 3% to 5% caustic soda to stabilise the sodium hypochlorite (the bleaching agent), and that makes it very strongly alkaline. Soap is alkaline, too. Alkaline solutions are bad for shellac. Alcohols = VERY BAD.
Mould is fairly common on 78s that have been stored in a damp shed or garage.
The best cleaning agent that is easily available is shower cleaner, which usually contains non-ionic surfactants that have additional anti-mould effects. Check the label - you want non-ionic, not anionic or cationic surfactants.
Using hand operated trigger sprays is a good way to wash and rinse. Rinse with small amounts of demineralised water.
Immersing 78s is a bad idea - a lot of them are laminated, the core is made of a composition of glue and fine dust, often coal or slate dust. The early ones have a layer of paper below the playing surface, on later discs the paper was eliminated and the shellac went straight onto the core. Prolonged immersion can make the surface blister and flake off.
Shellac does take up water (so does a sponge, and it doesn't dissolve, either) so it is wise to let a 78 dry for 24hr after cleaning, even if you do intend to play it "wet". Playing records "wet" increases friction, and the stylus gets hot. Personal experience has shown that playing 78s "wet" immediately after cleaning often results in fragments of shellac welding themselves to the stylus, and they are the very devil to get off. The best way I have found to play 78s "wet" is to apply the water with a "Lencoclean", so the water application is light.
If there is something greasy on a disc, lighter fuel (as used in Zippo lighters) is an easily available inert solvent for shifting it - a reasonably pure hydrocarbon mixture.
More of my drivel -
http://www.lenco-lovers.com/forum/viewtopic.php?t=225