ABSTRACT
Daguerreotypes and glass positives are generally coloured by a very easy process with dry brushes and powder-colours, by the aid of which some of the more skilful operators produce effects closely allied to those of coloured crayons. The method of manipulation is so very simple that, save in the selection of tints and colours, there is not much to teach, and consequently not much to be mastered by the pupil in the shape of mechanical difficulties. Until very recently, powder-colours were prepared with so little reference to the surface to which they were intended to adhere, that this branch of photographic colouring occupied a very insignificant position. Upon glass positives, water colours should be seldom used, as their effect upon such surfaces will always be strikingly inharmonious and offensive to good taste (although a touch or two may sometimes be carefully applied to produce the sparkling high lights of jewellery,), and are also, necessary in the treatment of certain defects.
