When I collected autographed bats I always used the regular / blonde bats with a blue sharpie. Red sharpie I would not be sure about since I know it will fade more rapidly than blue or black sharpie on photos and 3x5s over time and with exposure to light . Also silver ink in most cases is not sharpie but a form of "paint " that takes a while to dry when I got it on photos before.
Other bat collectors may know better. I am basing my opinion on collecting hundreds of flats and photos and only 15-20 bats.
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