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PFS StandardForensic DyeItem 1

Source Advanced Player's Guide pg. 254
Price 3 gp
Usage held in 1 hand; Bulk L
Activate Single ActionSingle Action Interact
Activating this vial of colorless liquid requires inserting a small amount of another chemical or material, such as blood or mud. The vial reacts rapidly, transforming into a murky, reddish-brown substance.

Once activated, the dye remains potent for up to 10 minutes, during which time you can spend 1 minute to brush it onto a single object of up to 1 Bulk or across the ground in a single 5-foot square. Where the dye comes in contact with an exact match for the activating chemical, it takes on a bright blue hue, while staying transparent in areas where there is no activating component present.