First time I've ever seen this. I'm preparing a marinade for meat. I slowly heat a stainless steel pan, pour a Tb grapeseed oil, and crush a couple garlic cloves in the warm (not hot) oil. Sweat for about a minute, add about 2 tsp salt and a couple Tb apple cider vinegar. Continue on low heat. I go to the fridge, get something, turn around... my garlic is all BLUE!!! I swear I've never seen this before. Wish I could post a picture. The blue looks completely unnatural. Very close to the color of a the blue sponge. Very "chemical" looking if you want: almost fluorescent. WEIRD! I suppose I'll throw the whole thing in the trash and try again now.