[cAnAry53]

the old guys on the allotments tell me my potatoes have got sprang,never heard of it,anyone got an explanation

[JayG]

Expect they mean "spraing" - lots of info if you Gurgle it and you will be able to make up your own mind whether they are right or not.

[Kleftiwallah]

Mid brown to dark brown shading within the potato.  We eat the spuds affected, and we're still here.  Looks worse than it is.

Cheers,    Tony.