Purple yardlong beans

[hiven]

Lately I fancy growing colourful vegetables, so far I have a light green bush yard long beans and red noodles yard long beans growing in my green house. The red noodles are making very attractive looking long beans and the colour stay after light cooking...so pretty !

I heard that purple yard long beans exist, is it true ? Have any of you grow it before ? Does it taste good ? productive ?
Oops sorry, I better stop asking too much questions...

Thanks in advance