<Li> In - glaze decoration </Li> <Li> On - glaze decoration </Li> <P> Firing produces irreversible changes in the body . It is only after firing that the article or material is pottery . In lower - fired pottery, the changes include sintering, the fusing together of coarser particles in the body at their points of contact with each other . In the case of porcelain, where different materials and higher firing - temperatures are used, the physical, chemical and mineralogical properties of the constituents in the body are greatly altered . In all cases, the object of firing is to permanently harden the wares and the firing regime must be appropriate to the materials used to make them . As a rough guide, modern earthenwares are normally fired at temperatures in the range of about 1,000 ° C (1,830 ° F) to 1,200 ° C (2,190 ° F); stonewares at between about 1,100 ° C (2,010 ° F) to 1,300 ° C (2,370 ° F); and porcelains at between about 1,200 ° C (2,190 ° F) to 1,400 ° C (2,550 ° F). Historically, reaching high temperatures was a long - lasting challenge, and earthenware can be fired effectively as low as 600 ° C, achievable in primitive pit firing . </P> <P> Firing pottery can be done using a variety of methods, with a kiln being the usual firing method . Both the maximum temperature and the duration of firing influences the final characteristics of the ceramic . Thus, the maximum temperature within a kiln is often held constant for a period of time to soak the wares to produce the maturity required in the body of the wares . </P>

What can be a type of course low firing clay and also the pot that is made of it
find me the text answering this question