I've been having the same problem with maris piper potatoes which are black under the skin. Bought from supermarkets. Thanks for letting me know what it is - bruising. Shan't buy this brand again.
I had a bag of Maris Pipers from Sainsburys which were badly affected. I know my brother (a potato farmer) would be embarrassed if he supplied potatoes in that condition ... farmers spend s as great deal of money on equipment to handle potatoes gently ... but I do wonder if the bags have been badly handled at the supermarket? I’ve seen bags of potatoes being ‘thrown’ when shelves are restocked. They wouldn’t do it to apples, but potatoes bruise just as easily.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.