Cold working refers to a mechanical operation that brings to glass a final appearance that could not be obtained by molding during the manufacturing process. Its purpose is to provide glass items with a plain, smooth and glossy final surface quality. 

Among these embellishments done to works seemingly already perfect, the first one that comes to mind is that which consists in removing traces of non-traditional manufacturing (such as the mark of the mold joint), by cutting or polishing. Drilling and grinding are used to refine a calibration.

This method of decoration uses a chemical process. It consists in removing outer layers of glass in order to give it its glaze and a smooth feeling surface.

The process is very strictly regulated and monitored.

The goal of sanding is to decorate the object to be treated, in whole or part, by giving it a glazed appearance. The method consists in projecting an abrasive with compressed air to give the surface an unpolished or ground look.

Over the past few years, glass tinted from block has been replaced by bottle coloring by means of lacquering, glazing or gun spraying. 

These automatic processes make it possible for bottles to have a larger variety of hues, colored or uncolored unpolished appearances with the option of modifying their degree of opacity and feel or even to simulate other materials.

The different types of markings make it possible to print any text or drawing on the bottles.

Screen-printing consists in depositing on the object to be decorated a quantity of glazing or organic enamels through a stencil screen. It is used for revolving shapes (cylindrical or unrolled) and flat tracks. 

When it is necessary to decorate concave shapes, a dabbing process of is used in order to ensure a close-fit with the objects. 

The decal process is used whenever the decorations include complex multicolored patterns.

Fashion trends are towards product sophistication and can lead to the fitting of metallic, plastic or copper asbestos accessories on a bottle.