You must always remember that if too darkly painted the pictures will be too opaque. Clouds can be put in nicely also with the bit of washleather, but extra work of this sort is hardly worth while. Then proceed to tint the other portions of the pictures with suitable colors, doing one color at a time right through the set of slides, but after applying each color, immediately dab with the washleather, to render the color even and light. You will find that by keeping to one color at a time you will get along much quicker, and will also make the pictures more uniform. When you have completely tinted all the pictures and "dabbed" all the colored portions, you may then go over them all again and shade them up where required with rather stronger colors, taking care, however, not to overdo this. You will find for faces yellow, with a very slight addition of crimson, answers the best. It may not look all right on the slide, but it will when thrown on the sheet. You will need to consider the effect of the various colors, as some show much more strongly than others. The next process is to varnish the glasses to render them transparent. With most color boxes for painting magic lantern slides a bottle of varnish for this purpose is supplied, which answers fairly well. It has to be painted on, after the slides are thoroughly dry, with a large camel's-hair brush. Lay one coat on by drawing the brush right across from one side to the other, taking care that the lines of varnish so deposited slightly over-lap one another. When this coat of varnish is perfectly dry and hard, another and sometimes even a third coat must be applied, and it is best to lay it on at right angles to the previous coat, so that all the surface is sure to be covered. Make each coat as thin as possible, and to facilitate this keep the brush soft by occasionally applying a little turpentine to it. This, however, is a slow and tantalizing process of varnishing, and there is an easier and better one. Procure a bottle of Canada balsam in benzole. It is used for mounting microscopic objects in, and can be got from any optician's. It should be quite fluid. Get a large wide-mouthed bottle and pour the balsam and benzole into it. Then add to it as much again pure benzole. It should now be nearly as fluid as water. This is your varnish. Apply it just as a photographer coats his glass plate with collodion. That is done in this manner. Take hold of the slide by one corner and pour on to it a sufficient quantity of the balsam and benzole to cover it.