Titanium white is the most widely used white pigment. It has outstanding opacity and good tint strength. Since its introduction in the mid 1900s, it has effectively replaced lead white pigment, which is toxic. Pure artist’s colours often need to be mixed with white in order to adjust them to the desired tonal value. Artists frequently find themselves going through amounts of white much larger than other colours in their palette. While the opacity of titanium white means that it has good hiding power, this quality also means that subdued “pastel” tints are created when it is blended with other colours. It is worth also considering zinc white and raw titanium, which have different qualities from titanium white, but which can both be used to adjust tonal value.