Optimization of enamel formulations to achieve desired optical film properties at minimum cost is a subject which has received considerable attention and made but little progress in the paint industry. Inquiries have not progressed as far as might be expected because of the cost of the extensive and precise laboratory work required presently. An extension of theory to practice was undertaken in this work. When thoroughly investigated, the new concepts developed should permit computation of film optics rapidly and with low investment.
In beginning the project, suitably reproducible laboratory techniques were developed and their precisions were estimated. It was then determined that pigment size distribution, pigment concentration, and distribution of wavelength of light interact to produce situations that have apparently not previously been recognized. Magnitudes of these effects are reported for a system of anatase-pigmented alkyd enamels, and the exploratory experimental procedures are outlined. Further work along these lines is encouraged, since the mathematical functions involved have not yet been completely defined for the general case.
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