Image Printing Limited offer commercial photo printing services for overseas customers. We are a professional printer located in Shenzhen, China. Red and some other colored inks are often found to become so hard in a few weeks after the can has been opened that the knife can scarcely be got into them, and they cannot be got to work at all commercial photo printing jobs. Oil, varnish and turpentine are of no use in such a case; the remedy is paraffin oil mixed well up with the old ink. Many prefer paraffin oil rather than boiled oil or tarps for thinning down both black and colored inks of commercial photo printing.
Colored inks can be kept from skinning by pouring a little oil or water on the top and closing the can tightly be commercial photo printing. Benzene is a powerful chemical preparation which may be used to remove colored inks when lye and turpentine fail. It should, however, not be used after dark, as it is very inflammable, and it should be kept out of doors if possible. Wood type when battered may be repaired by removing the damaged part with a sharp pointed knife, and fill in with beeswax or gutta-percha of commercial photo printing. The best inking surfaces or slabs for color work at press or machine are porcelain, litho stone, marble or slab. Metals are injurious to colored inks, even polished iron surfaces give a dullness to bright colors. If it is necessary to keep colored inks, the best way of preserving them so that they shall be workable after standing some time is to pour a little colza oil on the top, and securely close the vessel containing them. This oil will not generally rob the ink of any of its color, and even if it is not all poured off afterwards, its presence can do a piece of cotton wool; when dry, it may be washed in the same way as bronze. Rolling afterward will improve it very much.
Common qualities of colored inks may be brightened by using commercial photo printing the whites of fresh eggs, but they must be applied a little at a time, as they dry very hard and are apt to take away the suction of rollers if used for any lengthened period of commercial photo printing. For fine work, a little Canada balsam of the consistency of honey makes a good varnish of great purity. The coarser but similar Venice turpentine may also be used with effect where time is precious and purity of tint not indispensable of commercial photo printing. A little soft soap may be added to the Venice turpentine. Setting off may be prevented by slightly greasing or oiling a sheet which may be placed on the tympan if in press work, or the cylinder if at a machine. This will answer for several thousands without requiring to be replaced. A hardening gloss for inks may be made by dissolving gum Arabic in alcohol or a weak solution of oxalic acid free of commercial photo printing. This mixture should be used in small quantities, and mixed with the ink while it is being consumed. Some pretty effects can be produced by the use of a composition made by thoroughly mixing rice flour with cold water, and allowing it to gently simmer over the fire until a delicate and durable cement results from commercial photo printing. When made of the consistency of plastic clay, models, busts, etc., may be formed, and the articles when dry resemble white marble, and will take a high polish, being very durable. Any coloring matter may be used at pleasure.