An evaporating basin or evaporating dish is a small basin

Bowl (vessel)

A bowl is a common open-top container used in many cultures to serve food, and is also used for drinking and storing other items. They are typically small and shallow, although some, such as punch bowls and salad bowls, are larger and often intended to serve many people.Bowls have existed for...

 used to evaporate liquids to obtain the dry forms of the substances dissolved in them. Evaporating basins typically have a 4–5 in (101.6–127 mm) diameter, are made out of white ceramic, and have a lip for the pouring of excess liquid. They are usually 2–3 mm thick to aid heat transfer.

When used with a bunsen burner

Bunsen burner

A Bunsen burner, named after Robert Bunsen, is a common piece of laboratory equipment that produces a single open gas flame, which is used for heating, sterilization, and combustion.- Operation:...

they are placed on top of a wire gauze and tripod stand.