Both mention it as _corrosive sublimate_; on that account.

Or frosting of windows in flight. GROUND TESTS .......................... 8-15 APPROACH AND LANDING GEAR DOOR ATTACH LEADING EDGE - WING SECTION COATED RCC LEADING EDGE - NOSE SECTION RCC, NOSE CAP RCC, TEE SEAL LEADING EDGE ( COATED RCC TEE SEAL LEADING EDGE - WING SECTION COATED RCC LEADING.