Method for automatic preparation of solutions of liquid and dry materials

A method for the automatic preparation, on demand, of a liquid material from dry and/or liquid component materials, comprising the steps of providing a predetermined quantity, of fixed total amount, of a first component material, adding a predetermined quantity, of fixed total amount, of a second component material to said first quantity, at least one of said component materials being in liquid form, to form a mixture of fixed total amount having a predetermined concentration, providing a previously prepared supply of such liquid material, circulating such previously prepared material through a closed path, not including said fixed total amount of said mixture of predetermined concentration, withdrawing quantities of said mixture from said fixed total amount, in amounts that are small as compared with said total amount, and introducing said small amounts of mixture so withdrawn into said closed circulating path, and applying sufficient heat to the prepared material and the component mixture, circulating in said closed path, to cause any undissolved materials therein to go completely into solution, and, following such application of heat to said fixed total amount of the added component mixture, supplying the material, so prepared therefrom, for use.