My gush plants are doing the same exact thing. Bright purple when growing on the plant, once it's been drying for 6 days it doesn't look purple anymore but a dark, almost brown green. It might get that purple coloration back a little bit when it's fully dry, but I had some "Black" purple 2 years ago. If you held a dried bud up to the light it was purple, if you looked at it normally is was a black color that was none-too-satisfying to look at. But it does have a nice flavorIts not mold, but after its dried you no longer see the purple. Its jus green and brown.