The Cokin Filter A126 Gradual Mauve M1 colour graduated filter is colour tinted in one half of the filter and have a smooth graduated transition in the clear part.
Most Cokin graduated filters are available in two densities 1 & 2, where 2 is darker.
Cokin graduated filters can also be combined with each other. For example, you can use two graduated filters rotated 180 degrees to each other to blend colours.