It is customary to tip a hairstylist & colourist just as you would a server in a restaurant. If the service is excellent, then you tip 20%, if the service is good 15% and so on.
What if there are several different people involved from associates to the shampooer? It’s standard to pay $3 to $5 to each individual who shampoos and/or blows out your hair.
Now accepting tips on credit card!