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A-D Strips
Manufactured by the Image Permanence Institute.

Detect and measure the severity of acetate film deterioration, or "vinegar syndrome", in your film collections. Vinegar Syndrome is a slow form of chemical deterioration which causes the film to shrink, buckle and emit a strong vinegar odor. The strips are acid-based indicator papers that change color in the presence of the acidic vapor given off by degrading films. The strips are sold in packages of 250 strips and come with instructions and a color reference pencil.. IPI received a technical Achievement Award from the Academy of Motion Picture Arts and Sciences in 1997 for developing A-D Strips.