Dyfed,
United Kingdom 
We recently made jam from some blackcurrants only to find that the fruit contained some teeth breaking large stones. We have never experienced this before with our fruit
16 Apr, 2010
Answers
No way can you find tooth breaking stones in a blackcurrant... you've got something else in there as well
16 Apr, 2010
possibly sloes from the blackthorn.
16 Apr, 2010
Then the jam is likely to be sour I would have thought... Sloes used to get pricked and put into a bottle of gin to create sloe gin. Now if I understand correctly you freeze the sloes and then thaw them this softens them and you can bung into the gin without pricking!
17 Apr, 2010
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YOu sure they were blackcurrants, just blackcurrants, and some stray damsons didn't get in there too?
16 Apr, 2010