White hair would be electrolysis ONLY. You normally need 2-3 days of growth, just enough so the operator can get tweezers on them. The hair direction shows them which way to insert the needle, then they gently pull on the hair to determine if it's properly treated. When properly treated, the hair will slide out with no discomfort. I had a knowledgable operator who used the blend. It's a bit slower but there are no marks on my face as the result of treatment.