Final answer:
If the test strands did not relax enough when performing a preliminary strand test, the barber should try using a different relaxing solution or adjusting the processing time. Different hair types may require different approaches, so experimentation may be necessary.
Step-by-step explanation:
If the test strands did not relax enough when performing a preliminary strand test, the barber should try using a different relaxing solution or adjusting the processing time. They could also try using a different method, such as a different type of relaxer or a different application technique. It's important for the barber to understand that different hair types may require different approaches, so they may need to experiment with different options until they achieve the desired result.