What should you check if the eyebrow tint is not functioning as expected?

When the eyebrow tint is not functioning as expected, checking the tint-color-to-developer ratio is crucial. This ratio directly influences the effectiveness of the tint, as it dictates how the color develops and adheres to the hair. If too much developer is used compared to the tint, the color may be diluted and fail to achieve the desired shade or coverage. Conversely, too little developer can result in a product that is too thick or unevenly applied, leading to unsatisfactory results. Ensuring the correct ratio guarantees optimal performance from the tint, allowing for a richer, more vibrant color that adequately meets the client's needs.

The developer's expiration date, while important for safety and efficacy, is secondary to ensuring that the mixture of tint and developer is appropriate for application. Similarly, the ambient temperature can affect processing times and should be monitored, but the core issue often lies in the mixing proportions. Lastly, the timer is necessary for tracking how long the tint should process, but if the ratio is incorrect from the start, timing alone won't resolve the underlying problem.