Burnish golds

A solution 3.7 g 2,5-dimethoxy-3,4-(trimethylene)benzaldehyde in 15 g nitromethane was treated with 0.7 g anhydrous ammonium acetate and heated on the steam bath for 14 h. The volatiles were removed under vacuum, and the residue set up to 3.5 g dark crystals, which melted broadly between 126-138 °C. Recrystallization of the entire mass from 70 mL boiling EtOH gave 3.2 g burnished gold crystals with a mp of 129-137 °C. A further recrystallization of an analytical sample fromMeOH gave 2,5-dimethoxy-3,4-(tri me thylene)-B-nitiostyreneas yellow crystals with a mp of 146-147 CC. Anal. (C13H,5N04) C,H. 

Silver seems to exist in a number of allotropic modifications, besides that in which it is ordinarily met with. In one of these it is brilliant, metallic, bluish-green in color, and dissolves in HaO, forming a deep red solution in another it has the color of burnished gold, when dry and in still another it has also a bluish-green color, but is insoluble in water. Very dilute mineral acids immediately convert these modifications into normal gray silver, without evolution of any gas. 

Bessemer Converter. See converter. Best Gold. See burnish gold. 

Burnish Gold or Best Gold. The best gold decoration on pottery is made bright by burnishing, i.e. rubbing, usually with a blood-stone or agate. 

Gold Decoration. See burnish gold and BRIGHT GOLD. 

Shaking Gold, burnish gold (q.v.) suspensions, which require vigorous shaking to disperse settled particles, (a US term.)... 

The addition of Purple of Cassius gold, tin oxide, tin compounds, iron oxide, or aluminum oxide to burnish gold compositions was shown to increase the firing tonpaature up to 1400°C, and also increased the mechanical and chemical durability of the resultant gold film [85]. Best results were obtained on firing in combination with an intermediate layer consisting of one or a mixture of high... 

The preparation of liquid bright and burnished gold, F. Chemnitius, Sprechsaal, 1927, 60,182. 

Decorative burnish gold composition, W. Wild and G. Landgraf, U.S. patent 4,594,107, 1986. 

Improvements in or relating to liquid burnish gold for the preparation of ceramic transfers or for direct application to a heat resisting base, S. Chandra, GB patent 721,906,1955. 

Burnish gold decorating composition, G. Landgraf and W. Gobel, GB patent 2216536, 1989. 

---