The iridium is then precipitated from the solution (as oxide) by the addition of baryta, dissolved in aqua regia, and precipitated as iridium ammonium chloride by the addition of ammonium chloride. [Please select]
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Other catalytic agents have been recommended from time to time, including strontianite, lead oxide, caustic baryta, aluminium hydrate, but none of these is of any practical importance. [Please select]
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Natural Mineral Colours (Earth Colours): Yellow Earth Colours: Red Earth Colours; Brown Earth Colours; Green, Grey and Black Earth Colours: White Earth Colours: White Clay (China Clay): White Gypsum; Baryta: Magnesium Carbonate: Talc, Soapstone. [Please select]
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Cyanine appears to behave as an acid, at least it forms with lime, baryta, strontia, oxide of lead, &c. [Please select]
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