I love the brush I have one that looks just like it that I brush my Persian Kitty with :) Anyways On a serious note Not all brushes say it on them but you should always rinse out a new brush and I mean Before using it !!! Some brushes use to say it on the packaging but I don’t see it too much anymore - Some brands have Never had it on their packaging but I’ve always done it and I learned it from my grandfather who was a sign painter for more than fifty years… I played with all his brushes as a child and People called him Rembrandt he said that it “gets all the loose bristles out, there’s always a few “ I’ve been a profeesional painter for a long time now and a lot of guys I work with think I’m nuts or just wasting time when they see me doing it but it’s a habit at this point Love your brushes especially that three inch top coat brush I just ordered from you guys I can’t wait to use it btw You can’t find those in the stores you have your other brushes in Cheers