Found these random chemical preparations while sorting through the collection of stuff I inherrited: Edwal NO Scratch - 1/2 oz. glass bottle. (Resembles a bottle of nail polish.) Label says it contains turpentine & chlorothene. By taking a careful whiff, it smells like turpentine and chemicals. Braun Kov-A-Mar - 1/2 oz. plastic dropper bottle. (Resembles a bottle of eye drops.) No contents on the label. Smells like alcohol and something else. According to the labels, they are used for hiding scratches on negatives when printing. I've heard of things like this before but have never seen them. I suppose it could work if the damage isn't severe. Is this stuff useful? Does it work or is it snake oil. This stuff has been stored in boxes for 20+ years. I suppose it could be expired by now. No? I know chlorothene (AKA: vinyl chloride) is toxic and carcinogenic. If it's no good, I suppose I should take it to Haz-Mat Amnesty Day and dump it. What do you say? Keep it or dump it?