Document M9Eabw5BzXpOq02mdOkr8YBk

NEWARK PLART PIGMENT COLOR RESEARCH REPORT SPECIAL WASHING OF CHROME YELLOWS FILE; 114.2 DATE: October 15, 1935 N36979 DUP050316608 PIgMBHT COLOR RESEARCH REPORT SPECIAL WASHDB OP CHROME YELLOIS SOTKXTTED BTs APPROVED BY! q - ^X^asuioftj PXLSs GlRe-JISHMfS DATEs OCT0BSB IS* 1935 XHTRggyggTlO H During the past two months a study of the effect of special mashing on certain chrome yellow pigments has been made is order to ascertain the possibility of iaprenring their tinctorial and ink proper ties, and their stability* A number of colors: namely, Y-12-B, Y-1B0-D. Y-299-D, Y-316-T> Y-359-P were press washI a portion of the original batch being re tained in each case as a rat washed control. Rapid -vat washing was tried on the Y-309-D formulation, a control batch being run simultaneously in each case. SUMMARY & C0ECLU3X0SS A portion of one batch of Y-12-D was press washed* The vat washed control was a little on the green strong side of standard with worse light fastness. Press washing gave a lighter, oleaner masstone and s,better light stability against the control, with, however, a small de crease in strength. The light fastness of this portion was a little worse than that of standard. In ink mill tests, the mixing time for the pressed-was hod portion was much shorter than that for either the vatwashed control or standard, and its ink showed a little greater softness and flow* Mo breakdown was evident for any of the samples in a sino etch, standard however bleeding somewhat* With a chromic acid etch, all samples broke down quickly, standard being s. superior in this re gard, The vat washed control exhibited less bleed. Y-180-P Portions of four batches of Y-180-D were press washed, vat washed controls being retained in e&oh case, for comparison. The control for the first batch was dirty in mass tone and green in tint with a .worse light fastness than standard. Press washing gave a greener masatone with a weaker tint and still worse stability to light as compared to standard. It was slightly green and clean against control with a v.s. diminution in lightfastness. In the next three batches the amount of soda ash was increased, and the sodium bichromate and (Sulfate decreased. The controls on all of these were dirty and a little on the strong, green site of standard. Press washing gave greener cleaner masstones and - as a rule, tints that were a little weaker* In two oases out f three the lightfastness was somewhat improved as compared to control. In ink tests, the results of both portions of the first batch were poor as compared to Y-180-D standard In the case of the three batches made on the changed, forstulation, results did not seem to be conclusive. "ith the first pair (45242, 45250), press wash_ ,, se lightfastnean and.no change in ink properties. V,`ith the DUP050316609 2 next pair, the press washed material w.s worse In lithographic bleed but better in stability to light and resistance to livering. Mixing was improved. In t he caseof the last pair, press washing had little effect on ink properties or lithographic resistance except for a slight im provement in mixing time. Both batches showed more livering than stand ard. Y-a 99-13 One batch cf Y-299-13 was press washed for 30 minutes, the usual Vat washed control being retained. The control was red in mass tone and strong on extension with s.worse lightfaatness than standard. Press washing darkened the masstone and decreased the light stability by a vva amount. X=16d5 One batdh of Y-316-33 was press washed far 30 minutes. The control was a little red and dirty in mas at one against Y-316-D standard with & slightly weak red tint and. worse llghtfastaese press washing produced slightly cleaner material with a ws improrrasnt in strength and" light stability. Y-358-P...(Y~30fHD On t#o batches of Y-358-D wash waters were drawn at one hour in stead of at three hour intervals In each case a check batch was run simultaneously as a control. The control for the first batch was dirty in mass tone and v.s. red in tint with v.a. worse li^itfastness as comspared to Y-309-D. The rapidly washed material was cleaner than control in masstone and a little cleaner and greenor in tint. Light stability was v.s. better than that of control and equal to Y-309-B standard. In ink tests the two batches were distinctly inferior to Y-309-B, the ra pidly washed material. however, being superior to control especially in regard to lithographic bleed. The second pair were made on formulae identical to the previous ones except for an increase in the amount of salt. The control was a. light, clean and red against y~309-B with a v.s. red tint and equal light fastness. The rapidly washed material was closer to standard with slight ly improved light stability. In ink tests, the rapidly washed material was wer se in lithographic breakdown although the bleed was satisfactory. The control was inferior to standard Y-30SHD in the same respect. When the control rubouts on this- color dried, it was noticed that the control batches (i.e. washed at three hour intervals) became vary silky and changeable, a phenomenon not evident in the case of the rapid ly washed material. Y~55933 A total of three batches of Y-359-3) were press washed, a vat washed portion being retained for purposes of comparison. The two por tions of the first batch, struck with 15 lbs. of muriatic acid in the chromate, were practically identical except for masstone That of the control was slightly red while that of the press washed portion me DUP050316610 3 slightly green and dark. The tints were slightly strong and green. Light fastness for all three hatches averaged v.s, hatter than standard* In the second hatch the muriatic acid ms reduced to 6 lbs. The masatone of control was v*v.es. light and clean, that of the press washed part being v.v.s. clean. The extensions were slightly strong The last hatch was struck with no muriatic acid in the chromate - hat with 25 lbs* of sulfuric acid added after strike. The masatone of control was v.s. green and dirty while that of the press washed portion was light and slightly clean. The extensions were strong and slightly green. Re sistance to lithographic breakdown was satisfactory in all cases. On the whole, the effect of this special washing may be summarized In the following table; Soda Method of Wash Effect on Tinctorial properties Light Stability Effect on Ink properties Y-12-D Press washing It,olean masstone s.better 30* slightly weak Y-1S0-D If cleaner maus stone U Y-299-D no change no change better mixing. 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