Metallic Blue Pearl Essence paint has many uses on Trout and Saltwater fish. Polytranspar Pearl Essence waterbase airbrush paints are used to reproduce the soft translucent depth and the diffused reflecting qualities found in the pearly look of most fish. Pearl essence is most noticeable in the throat area and bellies of most fish. The wide variety of pearl colours offered by Polytranspar allows you to recreate most shades of pearl found in nature.