OCR Text |
Show DISAPPEABINO PAPER, -.--'. New York Tribune. . . Invisible ink and "sympathetic" ink are beaten entirely by a new development develop-ment in preparations of this nature reported re-ported by the trade journal La Pape-terie. Pape-terie. This is nothing-less than a dlsap pearlng paper. Thepaper intended for this temporary use is submitted to the following process: It is first steeped In acid (sulphuric acid by preference), diluted di-luted according to the lease of life it Is Intended the material should possess. It Is afterward dried and glazed and the acid superficially neutralized by means of ammoniac vapor. But the acid still remains in the pores, and the paper is Infallibly doomed after an 'existence more or less prolonged, as the case may be. It Is certainly a most useful Invention Inven-tion and should commend itself strongly to those who cannot trust their correspondents corre-spondents to "burn these letters." |