When using high volume developer on porous hair, what practice helps prevent damage?

• A. Skipping strand testing to save time.
• B. Increasing processing time for all strands.
• C. Strand testing to gauge processing time and lift.
• D. Using the highest volume immediately.

Answer: (C)

Strand testing is essential when using high-volume developer on porous hair because it reveals how quickly a strand lifts and what level of lift you’re getting. By testing a small section, you can gauge the processing time required for that hair to reach the desired result without over-processing. This real-time feedback lets you tailor the processing duration and choose an appropriate approach for that strand, helping protect the cuticle and reduce damage.

Skipping tests leaves you guessing about timing and lift, which can lead to over-lightening or breakage. Jumping straight to the highest volume on all strands is too aggressive for porous hair, since it tends to lift and damage faster. Some strands may process quickly while others lag, so a targeted strand test is the safest way to balance results with hair health.