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1. Blue means blue. 2. Most mushrooms blue within a minute or two. Bruising color changes can take up to one hour. 3. With most mushrooms, scratching them ushroom with a fingernail is sufficient. If you are looking for official bruising reactions, cut the mushroom in half vertically, then scrape the inside of one of the halves with your knife edge hard enough to bruise the tissue. With most boletes, simply exposing the inside tissue to the air is sufficient to cause bluing.