, used in many areas of manufacturing and art, is something that is added to parts of an object to create a pattern
by protecting these parts from being affected by a subsequent stage
in the process. Often the resist is then removed. For example in the resist dyeing of textiles, wax or a similar substance is added to places where the dye is not wanted. The wax will "resist" the dye, and after it is removed there will be a pattern in two colours. Batik, shibori
and tie-dye are among many styles of resist dyeing.
Wax or grease can also be used as a resist in pottery, to keep some areas free from a ceramic glaze; the wax burns away when the piece is fired. Song dynasty
Jizhou ware used paper cut-outs and leaves as resists or stencils under glaze to create patterns. Other uses of resists in pottery work with slip
or paints, and a whole range of modern materials used as resists. A range of similar techniques can be used in watercolour and other forms of painting
. While these artistic techniques stretch back centuries, a range of new applications of the resist principle have recently developed in microelectronics and nanotechnology
. An example is resists in semiconductor fabrication
, using photoresists (often just referred to as "resists") in photolithography.
Etching processes use a resist, though in these typically the whole object is covered in the resist (called the "ground" in some contexts), which is then selectively removed from some parts. This is the case when a resist is used to prepare
the copper substrate
for champlevé enamels, where parts of the field are etched (with acid
or electrically) into hollows to be filled with powdered glass
, which is then melted. In chemical milling, as many forms of industrial etching are called, the resist may be referred to as the "maskant", and in many contexts the process may be known as masking. A fixed resist pre-shaped with the pattern is often called a stencil, or in some contexts a frisket.
The Oxford English Dictionary
does not record the word "resist" in this sense before the 1830s, when it was used in relation to both "calico-printing" (1836) and metalwork with copper (1839). Resists were also used to etch steel
from the mid 19th-century.