You should be offering coupons or free product for your reviewers.... Anyway, Just For Men medium color works just fine but requires the user to try a few boxes to get the exact application time down. Targets just the grey hair? Not true. The chemical doesn't know which hairs are which color. Leave it on your hair too long and all your hair will be darker. The user should buy a box, pick a time to leave the solution in (like 6 minutes for example) and then rinse it out and check the result. The next time, you will know if you should leave the solution in longer or shorter. You'll also need to keep the number of days between treatments the same for reliable results. It would be nice if the product was a gel. Rinsing the liquid stain off in the shower can result in stains on the walls or ceiling.
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