Abstract: A hair treatment material applicator comprises a lid, a base, a hinge connecting the lid and base to allow pivotal movement of the lid and base with respect to each other from an open position to a closed position; and a bail pivotally mounted to the lid for pivotal movement from a use position above the lid to a latch position below the base holding the lid and base in the closed position. A compressible material, such as dense foam, is positioned in one of the lid and base; and a hair treatment material (such as highlighter, dye, bleach, protein treatment, etc.) is positioned in the other of the lid and base. The foam and material are positioned to allow strands of human hair to pass between them for uniform application of material to the strands. The hinge is an over-molded rubber hinge biasing the lid and base open.