Patent ID: 8100135

Claim:
A hair coloring system comprising: i) at least one container holding a coloring composition for forming a hair coloring product, said composition comprising at least one hair colorant; and ii) at least one test device designed to perform a test and comprising a tube having a sealed internal space containing at least one hair colorant of the coloring composition, the at least one hair colorant in the at least one test device being fluidly discrete from the at least one hair colorant in the at least one container; wherein the tube incorporates an outlet aperture, and wherein the test device is arranged such that the contents of the tube are expelled from the outlet aperture by the excess pressure within the internal space of the tube or when the tube is vented via at least one passage separate from the outlet aperture; and wherein a liquid or solid plug is arranged inside the tube to isolate the outlet aperture from the internal space of the tube, and wherein the plug is arranged such that it is discharged together with the contents of the tube via the outlet aperture when the internal space of the tube is vented or in response to excess pressure inside the tube.