Paraffin is a purified mixture of solid hydrocarbons expressed from petroleum distillates of higher boiling points. Properties:

Appearance...................................................

Odor .......................................................................................................

Touch.......................................................................................................

Taste ................................................................................

Color ..................................................................

Insoluble in H2O or C2H5OH. Soluble in ether, benzene, volatile oils.

Melting Point, 500 to 51 ° C. This is too high a melting point for practical utility in external medicine; 470 C. would be better.

Place a small amount of asphalt varnish in a test-tube; heat this in a water bath for half an hour. Place 0.75 Gm. olive oil in another test-tube, warm it on the water bath, add 2 drops of the hot varnish, mix thoroughly; then, with stirring, add this to 48.75 Gm. melted paraffin (melting point 47° C). Apply some of this to your knuckles, allowing it to cool. At the same time apply on other knuckles some melted official paraffin. When both are well solidified, note comparative

Offic. Paraff.:

Prep. Paraff.:

Pliability .........................................................

Pliability .............................................

Adhesiveness ......................................................

Adhesiveness ....................................................................................

Detachability...................................................................................

Detachability.......................................................................................

Ductility ...........................................................................................

Paraffin, prepared as above, is a useful surgical dressing.