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Bougie
A long slender instruand glue used to line the picture, as well as to make a similar addition to the varnish. If it has already commenced, the painting should be at once carefully cleaned and relined, observing to employ a little creosote in the way just mentioned. Paintings should be kept in as pure an atmosphere as possible, and in a moderately dry situation; as it is the presment, introduced into the urethra, œsopha- ence of sulphuretted hydrogen in the air that gus, or rectum, to overcome strictures of blackens the "lights," and causes most of those canals. Add 3 parts boiled linseed oil the middle tints and shades to fade; and it is to 1 part melted amber, and when mixed add exposure to damp that produces mouldiness 1 part oil of turpentine; spread the mixture and decay of the canvas. For this reason at 3 successive intervals upon loose spun silk valuable paintings should not be kept in cord or web, dry in a heat of 150° Fahr., and churches, nor suspended against heavy walls repeat the process until the instrument has of masonry, especially in badly ventilated acquired the proper size, then polish, first buildings. Excess of light, particularly the with pumice-stone, and afterwards with tripo- direct rays of the sun, also acts injuriously on li and oil. This is the original receipt of the paintings. The blackened lights of old pic- French Professor Pickel, and is still generally tures may be instantly restored to their origiused in Europe, slightly modified as fol- nal hue by touching them with deutoxide of lows: Add to the oil and amber, melted to- hydrogen, diluted with 6 or 8 times its weight gether as last, caoutchouc in the proportion of water. The part must be afterwards washed of of the weight of the oil employed; with a clean sponge and water.