Blackplate is hot rolled or cold rolled,DIN 55405:2006-11 Verpackung - Terminologie - Begriffe, Berlin: Beuth Verlag. non-descaled sheet steel or sheet iron.Blackplate at www.merriam-webster.com. Retrieved 30 Apr 2017.
Manufacture and properties Blackplate is made of non-tinned iron or steel and is annealed on open flames or in an annealing box. Its dark appearance is caused by its reaction with the surrounding air. During warm rolling, blackplate can be manufactured to thicknesses of 1.5 mm or more.Entry on Schwarzblech at europerf.org, retrieved 27 March 2012. Cold rolled blackplate, by contrast, can be made thinner – thicknesses of 0.4 to 1.5 mm being attainable – and produces better surface qualities.
See also Tinplate
References