1.   Blue pigments were rare and expensive.

2.   A blue-gray color called smaltwas the only blue pigment available to most painters.

3.   He became an international sensation for art-pranks like dragging a nude woman, whose body was coated in blue pigment, across a canvas on the floor.

4.   The deep blue monochromatic painting, with sponges impregnated with blue pigment, became the surprise of the evening.

5.   You see, the rose family has no members with blue pigment to use as a starting point for breeding.

6.   The desert work was not intended to last very long because strong fall winds would have scattered the blue pigment.

7.   The piece was not intended to last very long because strong fall winds would have scattered the blue pigment.

8.   They then started filling the circles with the blue pigment.