What is the melting point of paraffin wax used for routine work?

• A. 60 deg C
• B. 50 deg C
• C. 56 deg C
• D. 48 deg C

Answer: (C)

In routine histology, the paraffin wax chosen for embedding is formulated to melt around mid-50s Celsius. This melting point is ideal because it makes the wax fluid enough to infiltrate tissue thoroughly during embedding, yet keeps temperatures below levels that would damage delicate tissue structures or alter staining characteristics. When the wax is around 56°C, it can flow easily to fill spaces and provide solid support once it cools, allowing very thin, crisp sections to be cut. If the melting point were higher, tissues could be overheated and distorted; if it were lower, the wax might be too soft at room temperature and sections could distort or tear. Therefore, 56°C is the standard melting point used for routine work.