Gold yellow

The compounds of the rare earth elements are usually highly colored. Neodymium s compounds are mainly lavender and violet, samarium s yellow and brown, holmium s yellow and orange, and erbium s rose-pink. Europium makes pink salts which evaporate easily. Dysprosium makes greenish yellow compounds, and ytterbium, yellow-gold. Compounds of lutetium are colorless, and compounds of terbium are colorless, dark brown, or black. 

Purple of Cassius was used not just by glassmakers but by porcelain manufacturers to make a fine red glaze. But how yellow gold creates a red colour remained a mystery for almost 200 years. The ruby hue... 

In Ref. 99, yellow-gold films were obtained that gave no XRD pattern, but the chemical composition (as well as color) was consistent with SnSi. Increase in pH (more than 2) reduced the deposition rate, while increase in temperature led to precipitation in solution and therefore thinner films. 

The [RuC12L2]3 complexes are yellow-gold, neutral species, and the molecular weights in benzene correspond to a trimer. Gouy magnetic measurements show moments of about 0.6 BM per trimer at 20°C which, in view of the air sensitivity of the compounds, is consistent with diamagnetic Ru(II) complexes. Strong ir bands at 1105 and 1110 cm-1, respectively, for the MBMSO and MPTSO... 

Iron is obtained from misy, a yellow, gold-appearing, hard stone (pyrites ). Pliny vaguely describes under the same name a product formed by roasting a copper ore. According to Berthelot, the misy of Pliny is the product of a gentle oxidation of copper pyrites, a mixture of basic sulphates of iron and copper.48... 

Whenever possible the preparation and handling of carotenoid solutions should be carried out under yellow/gold fluorescent lighting to avoid light induced degradation. 

A solution of 6.64 g 3,4-ethylenedioxybenzaldehyde in 40 mL nitroethane was treated with 0.26 g anhydrous ammonium acetate and held at reflux for 3 days. TLC analysis showed that there was much aldehyde remaining unreacted, so an additional 0.7 g ammonium acetate was added, and the mixture held at reflux for an additional 6 h. The excess nitroethane was removed under vacuum. The residue was dissolved in 30 mL hot MeOH which, with patience and slow cooling, finally deposited a heavy yellow-gold powder. This product l-(3,4-ethylenedioxyphenyl)-2-nitro-propene melted at 95-96 °C and weighed 6.03 g when air dried to constant weight. Recrystallization from either MeOH or EtOAc gave the product as a yellow solid, but without any improvement in mp. 

White, ductile, moderately hard —beryllium, aluminium, gallium, indium, tin, silver, nickel. Red, copper. Yellow, gold. 

Appearance Yellow-Gold Liquid pH (1% Soln.) 5.0+-1.0 Specific Gravity 1. 02+-.01 Solubility Emulsifies in Water... 

What is the resistance rating of a resistor with the markings (from left to right) red, brown, yellow, gold ... 

A method for producing an improved antimicrobial material is disclosed whereby a soft, diy, iodine/acetalised polyviityl alcohol complex sponge material is produced which has a pleasing yellow-gold colouration indicating activation of the antimicrobial elements in the complex. 

Needles from alcohol, mp 188° (sublimes). Practically insol in boiling water slightly sol in glacial acetic acid, chloroform, benzene, warm phenol. Sol in abs alcohol 1 part in 60. Its soln in sulfuric acid is yellow-gold. 

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