An algorithm to convert Munsell notations to pccs Hue·Tone notations, which have been often used for a color-communication purpose in color-design fields, has been developed ; a computer program has been written in BASIC for micro-computers. In this method, utilizing a search routine, the closest pccs standard Hue·Tone for a sample is found by the two-division iterative technique.
In order to give a pastel color to an anodic oxide film on aluminum, electrolytic coloring in aluminum sulfate solution containing nickel (II) sulfate, cobalt (II) sulfate, or zinc sulfate was studied. When DC controlled potential used for the electrolytic coloring was more cathodic than -20 volts, brownish or grayish pastel color was obtained from electrolyte containing Ni2+ or Co2+, or Zn2+, respectively. These colored films were subjected to the anodic stripping and the line analysis by EPMA. It was found that the pastel-colored films were formed in the following way. First the films showed brown or gray because the added metallic ions were reduced and deposited in the bottom of the film pores. Then the top of the films became white because multinuclear complex ions of Al3+ were migrated and deposited.
Silica films were prepared by the dip-coating method from a stable hydrosol which was obtained by the hydrolysis of tetraethyl orthosilicate. The stable thin films, in the hues of the rainbow, having thickness of 0.9-4.6μm were formed on substrates, such as stainless steel, glass and quartz plates. Infrated absorption of the films prepared at various pulling-up rates was measured. Skeletal vibrational absorption of silica were clearly found. From the intensity change of the absorptions at 1210, 1140 and 1060 cm-1 which were assigned to the skeletal Si-O vibrations, it was found that the stability of the coated film depended upon the rate of pulling-up and the degree of polymerization of the silica hydrosol.