‘The name “transferware” comes from a 19th century technique [according to which] a pattern is engraved onto a copper roll, printed on tissue paper,and transferred onto earthenware dishes’
[according to which] is wrong, and should be replaced by [whereby]. Can you precisely please explain why? Thanks!
This is all about the precise definitions of the phrase “according to which” and “whereby.” (“Whereby” means “by which.”) Since a technique is a process, not necessarily a written document one can refer to or a statement someone made, it’s just better to use “whereby” than “according to which.”