https://old.reddit.com/r/typewriters/comments/1m3qt9x/ribbons_where_to_buy_in_uk/
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Glycerine, castor oil, and mineral oil are suitable;€.8. 15 per cent arachis (ground nut) oil, 15 per cent sperm oil, 70 per cent mineraloil.
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T.H. Dixon and Co. Ltd, are one firm making machines for typewriter ribbon€.
T.H. Dixon & Co. Ltd. manufactured machines for typewriter ribbon processing and had a method for spraying a coating to the edges of ribbons in a special chamber to prevent the edges of the ribbon from fraying. (p219)
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A furtherrefinementinmaking two-colourribbonsisthe useofacentreliningmachine, which automatically drawsathininsulatinglineon theribbon.A transparentgumsolutionispumpedbyairpressure througha stainless needle whichpreventsthecolours from running.
Center lining machines are used to make bichrome typewriter ribbon. It operates by drawing an insulating line on the ribbon and transparent gum solution is pumped through a needle using pneumatic pressure to keep the two colors from running into each other.
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