I also didn't know until I found these,
Vulcanite bottle stopper from Stag Beer Bottle
found on the road (Hockey Astro parking area)
on the bank behind the hockey supporter seating
Vulcanite Bottle Stoppers
The stoppers are made by heating India rubber to 115 degrees together with linseed and sulphur.
This creates a strong and durable material. The process is called "vulcanization".
I created this piece of ShardArt for Dave when he left Jeppe.
Please check out this link - my favourite Mudlark from the UK, NICOLA WHITE
http://www.tidelineart.com/tideline-art-blog/my-story-of-vintage-vulcanite-screw-bottle-stoppers
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