I've been using 1 1/2 tablespoons of Mar-V-Cide per jar for at least 40 years. Color of solution using this amount has always been a very deep blue to the point it "stains " my silvertips slightly, but wears off after a couple of shaves . I recently bought a new container of Mar - V - Cide , and my usual dilution produced a very light blue solution. I added another half tablespoon and the solution is still nowhere near the rich deep blue I'm used to. Has the formula changed ?... I've always used Marvy over Barbicide because it contains twice the disinfectant for the same price , hence a final solution that costs 50% less.