why does black paint never come off a paintbrush?
complicated problem do a search at google or bing this could help
Black Paint has a particular chemical inside which allows the paint to either smell,become hard or stick to the brush, a good way to get rid of it is to scrub it with your fingers until its off. Never will you get a brush which has had black paint on it spick and span, it is permanently stained but you can make it dry and not produce color when painting others. Do not try to buy other black paint as every single make has the same chemical, its the only way to produce black paint.