A Level 4 wants to go blonde—do you sit her under the dryer with a head of lightener? What about popping a processing cap on a platinum retouch Working with bleach can be painful—and it hurts even more when the client calls back to say she has sores all over her head. You all weighed in on how to handle THAT situation (read all about it here!), but it opened up another point of discussion…when (if ever) should you use heat—from a dryer, infrared heat, or a processing cap—to speed up lightener? Check out all the…