One of the hazards of painting is getting covered in paint! I stuck my thumb in my pallette and splodge, all over my thumb. Luckily I didn’t get any on my clothes! I can wash acrylic off my hands, but once it’s dried it’s impossible to get out of your top or trousers. Oil paint can sometimes be removed as it’s slow drying and you can use thinners to remove it, but once acrylic is dry it’s solid like plastic. You might be able to peel a bit off but it gets in between the fibers and sticks. Anyway, I love this colour blue. Ultramarine? Not sure….