On the other hand, if you wanted something stiffer without having to add a lot of pigment, with a bit of egg yolk, you can create a high impostor paint, she said, referring to a painting technique where the paint is laid out in thick enough strokes. Using less pigment would have been desirable centuries ago as certain pigments such as lafazlozi, which had been used to make ultramarine blue, were much more expensive than gold, believe it or not