Red Seal Cosmetology Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

Alkaline waves, also known as cold waves, usually have a pH range of 9.0 to 9.6. This pH range is necessary for the chemical process to effectively break and restructure the hair bonds, allowing for the desired texture and curl to be created. Option A is incorrect as it falls within the acidic pH range and would not be effective in creating a lasting curl. Option B is also incorrect because it falls within the neutral pH range and would not have enough alkalinity to create a lasting texture change. Option C is also incorrect as it falls within the mildly alkaline range and may not have enough strength to properly process the hair. Therefore, option D is the most appropriate pH range for alkaline waves.