How frequently should hair color be checked during processing?

Checking hair color during processing is crucial to ensure the desired results are achieved without over-developing the hair. Monitoring every 5 to 10 minutes allows the stylist to assess the color's development, making adjustments as necessary, such as rinsing if the desired tone is reached before the full processing time is complete. This frequent checking helps prevent unwanted outcomes like over-processing, which can lead to damage or undesirable color results.

Using a more extended interval, such as every 30 minutes or only at the end of the processing time, would increase the risk of not catching issues in time, while continuous monitoring can be impractical and inefficient in the salon setting. The 5 to 10-minute interval strikes a balance between vigilance and ease of workflow, ensuring optimal results for the client.