We have been working on a way to determine the density of a material in another material. Basically, with the RP inside of the modified alcohol. We are in the development phases of that right now and it uses a density meter. The RP content goes up, then sound waves flowing between the forks go up because the density goes up. We are looking into that right now so that there might be a way in the future to automatically measure and maintain the RP concentration. We might have more on that later.