Sirchie FR201 Fuming Control Cards, Book of 50

Help minimize over or under fuming with cyanoacrylate using these handy Fuming Control Cards. Simply tear out a card from the book of 50, then place control prints on the black side of the control card. Place the card in the fuming chamber before fuming begins. During fuming, watch for print development, and stop the fuming process when prints on the control card are properly developed. Cards are 2.25" x 4" with a 1/4" hole for easy hanging from evidence support rods.