Glad to hear you were able to eliminate any blackberry stains. At least your disaster would smell good. I've had enough similar stories to make one wonder if I'm a slow learner, clumsy, or what but the worst was picking up a gallon of paint and giving it a good shake thinking the lid was fastened. Nope. Baby blue latex wall paint all over my sewing machine cabinet, carpet, me, and everything else within reach of a good shake. For future reference yes, latex paint does wash out/off of things. I hope you really enjoy every spoonful of that jelly.