Cassette

A histology processing cassette comprising a box comprising a compartment for holding a biological tissue sample, the box having a bottom face comprising at least in part a sample support surface and being transmissible to radiation, an open top face, and two side walls, a back wall and a front wall, the box comprising a recess in the front wall adapted to receive a standard size cassette and the box having dimensions greater than a standard size histology processing cassette such that the box is adapted to envelop the standard cassette wherein the standard cassette has a front wall comprising a unique identifier for the biological tissue sample wherein the compartment is located in an upper portion of the box and the recess is located in a lower portion of the box and under the sample support surface the arrangement being such that upon insertion of the standard cassette in the recess the unique identifier on the front wall of the standard cassette is readable.