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Transition Colour-Changing Mug A unique, useful and fun promotional gift. Outer wall of mug appears black when cold then turns white when hot beverage is added , revealing logo • AB grade ceramic: 9.6 ( h ) • 0.325L Ceramic care instructions: · Do not scratch print · Avoid using strong detergents to clean · Hand wash only · Do not use scourer or abrasive cloth to wash · Do not soak in hot water for prolonged periods