Method of obtaining a colourless to high levels of potassium hydroxideFERRARA ITALOFERRARA ITALO
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solution,15mlofwaterR,5mlofhydrochloricacidRand4gofpotassiumiodideR,closethe flask,allowtostandinthedarkfor15minandadd100mlofwaterR.Titratetheliberated iodinewith0.1Msodiumthiosulphate,using0.5mlofstarchsolutionR,addedtowardsthe endofthetitration,asindicator. ...
Potassium hydroxide or another alkaline potassium compound is used to adjust the pH of an aqueous color developing clay coating composition in the manufacture of color developing material for use in pressure-sensitive or similar copying systems. This reduces the decline in reactivity with time of such...
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It has been observed in the late nineteenth-century when Buckton stated that adding caustic potash or lye [potassium hydroxide (KOH)] to aphin dye extracted from the pine tree aphid, produces a fine crimson colour [23]. The potash method was adopted and reconstructed using the localized giant...
This solution was composed of calcium chloride (2.2 mM), monopotassium phosphate (2.2 mM), acetic acid (0.05 mM) having pH adjusted to 4.4, and potassium hydroxide (1 M) (Prasada et al., 2018). 2.2. ICON infiltration treatment A 15% hydrochloric acid gel (Icon-Etch) was applied on ...
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mixture of a calcium compound (carbonate, sulfate or hydroxide), copper compound (oxide or malachite) and quartz or silica gel in proportions that correspond to a ratio of 4 SiO2 : 1 CaO : 1 CuO to a temperature of 900°C using a flux of sodium carbonate, potassium carbonate or borax....
There are also variants containing other positive ions such as potassium K+ or sodium Na+. The pigment is decomposed by dilute alkalis to form brown iron hydroxide, but it is resistant against dilute mineral acids and withstands temperatures up to 140 °C. It is compatible with many pigments...