I have been using this hair dye ever since it was released in the market. Its excellent for the first time use, slowly the efficacy reduces the second time and its absolutely useless the third time. Infact I seal it well with an extra air tight sealer after every use, still its of no use. I would suggest to give small sachets instead of one big pack which will be much effective. However this is the only dye I have ever used, I have sensitive skin and hair and I absolutely don't have any other problem using this dye.