Most people use small beakers or syringes to measure the Pyrocat-HD stock solutions. I use a 10ml beaker for measuring small amounts and a larger 50 ml beaker for larger amounts. The difference between 4 and 6 ml of solution would not be catastrophic, but it would nevertheless have some impact on results.Originally Posted by SchwinnParamount
Be careful that you don't contaminate the stock solutions when mixing. This will shorten drastically their shelf life.