How can you determine if the metal is sufficiently hot to apply the browning solution?

Determining if the metal is sufficiently hot to apply the browning solution relies on the behavior of the solution itself when it makes contact with the heated surface. When the browning solution evaporates immediately upon application, it indicates that the metal has reached a temperature high enough to trigger rapid evaporation. This quick evaporation signifies the metal’s heat is adequate for the chemical reaction required for browning, allowing the solution to work effectively.

The other indicators, such as the metal turning a bright glow or discoloring, can vary based on the type of metal and the specific browning technique, and thus are not as reliable as the immediate evaporation of the solution. The sound upon application is also not a consistent or definitive measure of temperature, as many factors can influence whether a sound is produced when the solution contacts the metal. Therefore, observing the immediate evaporation of the browning solution is the most effective way to confirm the correct temperature for the process.