It is said that the use of the masking film is for the compensation of the lack of density which is caused by the undesirable absorption of colors in the copy film.
If it is true, the use of the multilayer masking film will be not reasonable when the primaries of the masks do not coincide with that of copies. In fact, conventional mask method gives better result than the multilayer mask method (masks are made from conventional nega-color film).
However, as the masks are used together with color separation filters, the function of masks can be expressed as the density of primary dye against the separation filter, and replacement of the colored mask images by the equivalent neutral (silver) images makes it easy to understand these functions.
Masks for color correction can be expressed as the reversed matrix of color density of primaries used in reproduction. As the results of calculation of matrix it was revealed that the use of two masks for each separation negative is invariably necessary.
Our experiments show that the conventional three-layer nega-color films are not suitable for the color correction because of the lack of cyan density against the separation filter.

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It is known that “Thermal Analysis, Splinter Plane Inspection, Chemical Analysis”, etc. have been applied to the analysis of lead alloys. Conspicuous errors, however, have been resultant from these analytical operations when impurities especially likewise copper or zinc and arsen are contained. Henceforward, there arises a need of study on analytical method-safe accurate and rapid.
The new method which we invented is called as “Simultaneous Determination after Fractional Distillation of Arsen”. This was made with sixteen cases which were previously arranged. The results were favorable and we found the errors to be ±0.3% (antimony), 0.05% (tin) and ±0.05% (arsen).

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In order to clarify the foundamental process of liquid development of electrophotography and electrostatic printing, the adsorption characteristics of carbon black fine powders dispersed in ligroine on the charged surface were studied, varying some experimental conditions. The sample plate were made by coating the VYHH resin (vinyl chloride, vinyl acetate copolymer) on the glass plate with chromium plated. The surface charge were given by corona discharge and measured by sector type electrometer as surface potential (Voltage).
The quantities of carbon black powder adsorbed were observed by using the optical densitometer. The experimental equipment is shown in Fig. 1. Fig. 2 shows the charge decay characteristics of insulator surface in both air and ligroine only. In the range of carbon black concentration of 0.01-0.1W% under the surface voltage 200V, the adsorption characteristics are shown in Fig. 3-6.
The initial rate of adsorption in Fig. 3-6 increases linearly with the carbon black concentration as shown in Fig. 7. The maximum adsorption in each concentration approaches rapidly to the saturation state, shown in Fig. 8. The charge decay characteristics of carbon black adsorption are shown in Fig. 9 and 10, and the relations between both initial charge decay rate and maximum charge decay and the carbon black concentration are exhibited in Fig. 11 and 12 separately. It was observed that these results correspond to the characteristics of adsorption in Fig. 7 and 8. Fig. 13 shows the linear relation between the initial rate of adsorption and the initial decay rate of charge.
Each adsorption characteristics under the constant carbon black concentration of 0.05W%, varying the surface voltage 0-350V, are shown in Fig. 14-17. It seems that the charge characteristics of the initial rate of adsorption for postive surface voltage are not so simple as in the case of constant voltage, except negative surface voltage in which the linear relation can be found as shown in Fig. 18. The maximum adsorption of carbon black for surface voltage also are not linearly but more complicated as shown in Fig. 19.

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It is not only inconvenient but non-economical to manufacture a vast kind of inks and store them, and there have been many efforts to restrict and controll the number of kinds of ink colour between both ink makers and printers. But they haven't yet accepted them sufficient on the number.
Therefore I investigated and sampled the scattered colours in our country and selected the necessary colours through voting by printers, graphic art designers, printing engineers and ink makers.
Then I tried to assure whether or not these necessary colours could be reproducible as printing ink colours by mixing the available printing inks. As results I found they can be reproducible with 49 basic, available printing inks and determined them as the basic printing inks.

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After choosing one way to compare the degree of ink-setting, on multicolor printing, the after-tackiness was measured with it, and led next results. Lithographic inks were used for this testing.
About one color printing the measuring indicated its setting value over 500g/cm² in one minute. However the more printed colors piled up were indicated the lower value with piling times, and time to reach to a high degree of setting state was prolonged. 5 times piling of multicolor printing took the time for over 20 minutes keeping the value below 20g/cm².
On a sample degree of setting, once indicated a high value, showed retrogradation.

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