If you are using dilution B, for a 500ml solution (which is roughly equivalent to 16oz), I would measure 1/2 oz of the thick yellow concentrate directly from the bottle into a graduate and add 16 oz of water at 68 degrees. If you plan on using HC110, invest in a small graduate (Patterson makes a nice one) to assist in measuring. That's my basic set-up when I'm making a 1/2 litre working solution of developer.