X4 has all the essential and distinctive characteristics of a paint which delivers high pigmentation and superb mixing and laydown properties. Its lightfast rating will ensure that work looks at its optimum for decades and each batch is tested to ensure quality remains constant. 21 colours to choose from, each with its own unique opacity and lightfast ratings to give you an informed choice. Buy one of the best artists' acrylics at prices which are hard to ignore. 500ml bottles.