What happens if you apply a dark golden blonde to a medium golden chestnut brown?

Applying a dark golden blonde to medium golden chestnut brown will likely result in a shade that appears warmer and lighter than the original. The underlying golden tones in both colors may blend, creating a rich, warm hue with added brightness. However, the final result can vary depending on the hair's porosity and previous color treatments, potentially leading to unexpected shades or highlights. Always conduct a strand test to ensure the desired outcome.