Black Runner Bean Seeds

We picked quite a few runner bean pods yesterday that had gone to seed.Mergoles and I thought Enorma,but now looking at them think they may be Scarlet Emperor.

On opening some of them found that the seed inside was jet back instead of the ususal speckled colouring.

I expect that they are not a new variety I have some how bred with a crossing with the Mergoles,but it would be interesting to see if any one else has experienced the same thing.

Could it have been the weather conditions that have made the seed go black? Up to yet I have found about fifty from the ones that I have podded

 

Hi Kandyfloss,
I've read about a bean called the Cherokee Trail of Tears pole bean. It's a black heritage bean that was grown by the Cherokee Indians. It sounded fascinating. Could you have this instead and not a cross?

 

luckyboo.I checked on Google and it says the beans you mentioned are climbing french beans,ours are Runner Beans that climb