This porcelain spot plate (cavity plate) has 12 depressions or cavities, each about 20 mm in diameter at the top.
Use this porcelain spot plate to perform multiple chemical reactions on very small amounts of materials. The white spot plate is especially useful to observe color change reactions. Porcelain is durable and is resistant to most corrosive chemicals. It is also easy to clean, and autoclavable.
Cavity plates are suitable for observing color reactions and temporary storage of small specimens and solutions. These cavity plates are used extensively in semi-micro chemistry. They are glazed on the top and sides and the depressions are 22mm in diameter and 6mm deep.