To Detect counterfeit notes.
--The New Orleans Bee
of a late date says that spurious Confederate notes which are in circulation may be easily detected by applying to them a solution of the cyanide of potassium.
Five cents worth of the article dissolved in an ounce or two of water will last ten years.--When the genuine note is tested by the cyanide, it undergoes no change, but the counterfeit is immediately discolored, assuming a yellow tinge.
In a few moments the photograph becomes completely effaced.
The test has been used in several instances with entire success.
The only caution to be observed is by no means to allow the cyanurate, of potassium to come in contact with the tongue, as it is a deadly poison.