I have a feeling that sometimes the method of storage as the beans dry can have an effect on the final color they turn out to be. As think I mentioned before, when I first planted the seed of Fort Portal Mixed it really DID look quite mixed. The coats went from a middle tan, to a medium brown through a sort of maroon (slightly more purple than the iron red one is used to seeing in kidney beans but not by much) down to a deep purple that was for all intents and purposes black (I actually wound up planting one Fort portal mixed in the original pot of Mottled greys (the one that died in the storm) because I couldn't tell it from a not mottled MG which are also black) In fact out of all of the seeds, only ONE was bright purple (and as that one didn't get planted until the second year, after I shared seed out with those who have it, none of the Fort Portal Violet anyone else has in this thread started out so. But when the seed came back, it was all the bright violet color I sent out. And despite now having been grown by people like Seedobessor (whose climate is a bit colder than mine, and soil is richer) and flowerweaver (who's climate is a lot hotter, and soil probably a lot sandier) purple it has remained; no sign of the other shades. The situation with the Bantu mixed (like Fort Portal Jade, but not green) was more or less the same. all kinds of browns and tans going in, with no purple (except the off color Fort Portal Jade I tossed in, no idea if than was one of the ones that produced or not) came back ALL purple. When I get to doing the non mottled MG's next year, assuming I get any that make seed, if those turn out to be purple too, I won't be surprised in the least.