Hi there!
I have recently bleached my whole head from an orange /red colour and it's turned out pretty light but just left a dark yellow look...I have gave my hair a trim off all split ends and damage π Would It be safe to use a schwarzkopf cool blonde dye over this and trim it after ? π 8)
I'm not familiar with the Schwarzkopf Cool Blonde, but if its anything like their other box blondes, its probably got a pretty high volume bleach, so wouldn't be the best option. If you're hair is still closer to ginger than it may be alright, but if its at a true blonde stage then it would probably be better to either get a lower level bleach or too start bleach baths. If you don't want much lift and just want a cooler toned blonde it may be worth just trying to tone it