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Invented in 1798 by Alois Senefelder, lithography uses the fact that oil and water don't mix as the basis of the printing process. A flat stone such as limestone or a metal plate is treated so that the image area attracts oil-based inks and the wet non-image areas repel the oil-based inks.
Which Important group of keyboard pieces did Bach write to helpincrease the skill level of his students is because of the Well-Tempered Clavier.
Answer:
Heya! I'd answer your question, but you appeared to not add an attachment to your it. I'm unsure of what the choices are, so you may have to repost this? Apologies!