How can I check for porosity before having my hair relaxed or colored? | Sally Beauty

How can I check for porosity before having my hair relaxed or colored?

To determine if hair has the ability to absorb moisture, take a strand of hair and run it between thumb and index finger of the right hand, from the ends of the hair toward the scalp. If it ruffles or feels bumpy, the hair is porous and can absorb moisture.