Colorless

Finally, color is always examined since the solvent should be colorless when pure. Traces of heavy aromatics give the solvent a yellow tint. 

The gas is colorless, odorless, and tasteless. The liquid and solid forms are a pale blue color and are strongly paramagnetic. 

Phosphorus exists in four or more allotropic forms white (or yellow), red, and black (or violet). Ordinary phosphorus is a waxy white solid when pure it is colorless and transparent. White phosphorus has two modifications alpha and beta with a transition temperature at -3.8oC. 

Argon is two and one half times as soluble in water as nitrogen, having about the same solubility as oxygen. Argon is colorless and odorless, both as a gas and liquid. Argon is considered to be a very inert gas and is not known to form true chemical compounds, as do krypton, xenon, and radon. 

On the average, one part of radon is present ot 1 x IO21 part of air. At ordinary temperatures radon is a colorless gas when cooled below the freezing point, radon exhibits a brilliant phosphorescence which becomes yellow as the temperature is lowered and orange-red at the temperature of liquid air. It has been reported that fluorine reacts with radon, forming a fluoride. Radon clathrates have also been reported. 

If one heats acetone and pyrrole in the presence of catalytic amounts of acid, so-called acetone pyrrole is formed in over 80%i yield. This colorless, macrocyclic compound contains four pyrrole units which are connected by dimethylmethylene bridges, ft is formed by electrophilic-a-substitution of pyrrole by acetone, acid-catalyzed oligomerization, and spontaneous. 

They are used principally as intermediates for cyanine dyes that serve in photography (5, 6. 35. 36. 50-52). 3-Ethyl-2,4-dimethylselenazolium iodide (m.p. 157-8 C) was prepared as colorless crystals in 87% yield by Brooker et al. (6) by heating 2,4-dimethyls el en azole with an excess of ethyl iodide for 48 hr. 

Methanol is a colorless liquid boiling at 65°C and is miscible with water m all proportions It is poisonous drinking as little as 30 mL has been fatal Smaller amounts can produce blindness... 

Brilliant cresyl blue [3-amino-9-dimethyl- 0.583 0.047 0-11 Colorless to blue... 

Indigo-5,5, 7-trisulfonic acid (Na salt) 0.332 -0.081 <9 Colorless to blue... 

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