These mugs start off black but reveal the art when filled with hot liquid. https://www.etsy.com/shop/mizuarts?ref=simple-shop-header-name&listing_id=913235658§ion_id=27191625
These mugs start off black but reveal the art when filled with hot liquid. https://www.etsy.com/shop/mizuarts?ref=simple-shop-header-name&listing_id=913235658§ion_id=27191625