Abstract: A set of mugs has at least three mugs, each of the at least three mugs having a first printing and a second printing. The second printing is of thermochromatic paint which is positioned to selectively obscure the first printing at room temperature. The second printing is identical on each of the at least three mugs, and the first printing is not visible, so that the at least three mugs cannot be distinguished from each other when the at least three mugs are at room temperature. Each of the at least three mugs has a different indicia formed by the first printing, the first printing being visible when the at least three mugs are at an elevated temperature and the thermochromatic paint of the second printing is transparent.