checking
131ozone checking — Cracks or hard spots usually found on the sidewalls of tires. Caused by the action of the ozone in the air on the rubber. This condition is normal, but could be dangerous on tires that are more than 65,000 km (40,000 miles) old or have been… …
132gas checking — noun : a frosty wrinkled appearance of some coatings (as various tung oil varnishes) caused by exposure to gas fumes …
