_Clouds in Photographs_ (Vol. viii., p. 451.).--Your correspondent on this
subject may easily produce clouds on paper negatives by drawing in the
lights on the back with common writing ink. There is usually some tint
printed with all negatives, therefore the black used will stop it out.
It is at the same time unfair and untrue to the art, because clouds cannot
be represented in the regular mode of practice. If they appear, as they do
sometimes by accident, it is well to leave them; but in no art is any trick
so easily detected as in photography, and it cannot add to any operator's
credit in expertness to practise them.