Mixing process liquid color concentrates

This method can be used for the determination of the ozone concentration in the gas and/or liquid phase. The measurement takes place in the liquid phase, though, so that to measure a process gas containing ozone, the gas must first be bubbled through a flask containing potassium iodide KI. For the measurement of the liquid ozone concentration, a water sample is mixed with a KI solution. The iodide F is oxidized by ozone. The reaction product iodine 12 is titrated immediately with sodium thiosulfate Na2S203 to a pale yellow color. With a starch indicator the endpoint of titration can be intensified (deep blue). The ozone concentration can be calculated by the consumption of Na2S203. 

NHj)4Co(NH2,Cl)Co(NH2)4]Cl4-5H20 as prepared in Sec. G is dissolved in a minimum amount (about 50 ml.) of ice-cold water, and immediately one-third the volume of concentrated nitric acid (also at 0°C.) is added. The magenta-colored crystals obtained are filtered off, washed with ethanol and ether, and allowed to dry. About a 2.5-g. quantity of the nitrate salt of the aquo-chloro complex is obtained. This is added a little at a time to 500-600 ml. of liquid ammonia in a 1-1. beaker. The beaker is immersed in an ice-salt mixture, and the ammonia is allowed to evaporate overnight under a fume hood. The red solid which is obtained is placed on a sintered-glass filter funnel, just covered with water, mixed well, and then sucked dry. This process is repeated until the washings change from brown to red. The yield is around 70%. 

One method is adding color via concentrates or a masterbatch at the fabrication step (molding or extrusion). The process involves a two-component approach a natural polymer and a concentrated (solid or liquid) additive masterbatch metered and blended at the press. In this option, the fabricator must take responsibility for preblending the product, properly mixing and dispersing the two phases, and performing checks and adjustments to assure final color quality. 

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