This can be determined by patch testing. Chromates Chromates contain chromium, and are commonly responsible for allergic contact dermatitis from cement, leather, some matches, paints, and anti-rust products. Contact with chromium is common in jobs in the automobile, welding, foundry, cement, railroad, and building repair industries. Chromates are used to tan leather for shoes and clothing. Vegetable-tanned footware can be used as an alternative.
Some matches contain chromates.
Touching unlit matches can contaminate fingers. Fumes from a lit match and the charred match head also contain traces of chromates. Placing used matches or book matches in a pocket will contaminate the pocket lining. This plant family includes poison ivy, poison oak, and poison sumac. In the U.S. these plants produce many cases of allergic contact dermatitis.