DOUBLE SEATED LOCK SAFETY VALVE. A german journal gives the following method for impart ing a fire-proof bronze color to copper and brass. We cannot speak from any personal test as to the value of the method but have generally found such formulas coming from German sources to be correct. Should any of our readers try the ' One sixteenth of an ounce of crystallized verdigris aud solution left standing covered for three to four hours and over a charcoal fire until it is equally heated throughout and becomes uniformly tarnished. The copper is now to be rubbed over with the mixture and then
DOUBLE SEATED LOCK SAFETY VALVE. A german journal gives the following method for impart ing a fire-proof bronze color to copper and brass. We cannot speak from any personal test as to the value of the method but have generally found such formulas coming from German sources to be correct. Should any of our readers try the ' One sixteenth of an ounce of crystallized verdigris aud solution left standing covered for three to four hours and over a charcoal fire until it is equally heated throughout and becomes uniformly tarnished. The copper is now to be rubbed over with the mixture and then carefully dried. of this treatment the copper receives a brass color ; after from six to ten repetitions it acquires a fine yellow. If the copper is now to be changed from yellow to brown it must if however it be desired to have it very pale brown the process must be repeated twen the desired color is attained the copper is to be laid in clean or dry it rapidly after taking it out. This must be done care fully. The copper is then held Wood Gas. 49., scientific american, 1868-11-18
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