Red Seal Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Soft water is the type of water that allows soap and shampoo to lather freely because it has a lower concentration of minerals, such as calcium and magnesium, compared to hard water. Hard water, on the other hand, has a higher concentration of minerals which can react with soap and prevent it from lathering effectively. Salt water and distilled water also have different mineral compositions and are not commonly used for bathing purposes. Therefore, soft water is the best option for creating a rich and foamy lather with soap and shampoo.