28 MISC. PUBLICATION 679, U. S. DEPT. OF AGRICULTURE 



the mount it should be completely removed by using soft paper pads 

 saturated with a cleaning fluid mixture made up of 80 parts 95-percent 

 ethyl alcohol and 20 parts mineral spirits (painter's grade). A final 

 washing with soapy water is advisable to insure removal of finger marks 

 and traces of dirt. 



Finishing and applying background. — The edges of the mount should 

 be sandpapered or scraped to make them smooth and properly rounded, 

 and except when a background is to be attached a binding of transpar- 

 ent cellulose adhesive tape should be applied all around in order to 

 confine any excess of the cementing resin that may have been left 

 between the mounting sheets. If a background is desired a sheet of 

 white opaque Vinylite (0.01 inch or thicker) may be attached with 

 adhesive tape in such a way as to bind it all around or to hinge it from 

 the top so that the specimen can be viewed from front or back (fig. 9)1 



B 



Figure 9. — The finished mount is usually provided wit! 



card or white opaque plastic, overlaid if desired with creped fil 



is bound together with tape coated with pressure-type adhesive (B) 



cground of metal -coated 

 lm (A). The assembly 



