Hi, I have been growing borlotti beans for many years now and often use the seed from plants I've sown. I have had several years where some plants give beans inside which are either blue, purple, or black/grey. I have sown those beans and they continue to give plants with the same blue/purple colours. I wonder if anyone else has had this experience and I wonder if it is some genetic variation that's occurred. I'm not sure who to ask about this.