A formula is an entity constructed using thesymbols and formation rules of a given logical language. In science, a specificformula is a concise way of expressing information symbolically as in amathematical or chemical formula. Paint is any liquid, liquefiable, or masticcomposition that, after application to a substrate in a thin layer, converts toa solid film. It is most commonly used to protect, color, or provide texture toobject.Enamel paint is paint that air dries to a hard, usually glossy, finish,used for coating surfaces that are outdoors or otherwise subject to hard wareInk is a liquid or paste that contains pigments or dyes and is used to color asurface to produce an image, text, or design. Ink is used for drawing orwriting with a pen, brush, or quill. Thicker inks, in paste form, are usedextensively in letterpress and lithographic printing. or variations intemperature; it should not be confused with decorated objects in "paintedenamel", where vitreous enamel is applied with brushes and fired in akiln.Varnish is a transparent, hard, protective finish or film that isprimarily used in wood finishing but also for other materials. Varnish istraditionally a combination of a drying oil, a resin, and a thinner or solvent.Varnish finishes are usually glossy but may be designed to produce satin orsemi-gloss sheens by the addition of "flatting" agents.The termlacquer is used for a number of hard and potentially shiny finishes applied tomaterials such as wood.