A technical insert states that a toner should remain on hair 'no longer than 20 minutes at room temperature.' What does the phrase 'room temperature' specify in this context?
-
A
The product must be stored in a warm room before use
-
B
The service should be performed without applying additional heat sources
-
C
The salon's thermostat must be set to exactly 70°F
-
D
The toner requires a heated cap to activate properly