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Old 14th Apr 2021, 5:40 pm   #15
mole42uk
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Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
Default Re: Vintage Diagram Drawing Techniques?

Dried Rötring can always be cleaned with a weak solution of caustic soda - as a circuit draughtsman many years ago, I'd sometimes find that one of my pens had dried and it was a matter of a long soak, then dismantle it and soak again before a rinse in lots of water. Of course, putting the wire back into a 0.18 pen is not for the faint-hearted....and I'm glad I never tried a smaller one.
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