when was etching invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was etching invented	0.09	1	2389	60	25
when	0.32	0.5	937	1	4
was	0.05	0.5	8593	21	3
etching	1.53	0.6	8387	79	7
invented	1.52	0.8	4137	26	8

Keyword	CPC	PCC	Volume	Score
when was etching invented	1.3	1	1408	45
when was itching invented	1.33	0.2	660	97
who invented etching	1.45	0.9	9155	30
who invented aquatint etching	1.7	0.2	1106	13
when was chemical etching invented	1.7	0.4	294	13
when was etch a sketch invented	0.6	0.6	2825	18
who invented etch a sketch and when	1.52	0.9	9165	69
etching art history definition	0.83	0.7	8178	7
what was etching used for	1.7	0.7	6707	17
original etchings for sale	0.61	0.3	2014	33
a history of engraving and etching	1.38	0.4	1431	72
when was etch a sketch created	0.28	0.3	7362	96
how is an etching made	0.27	1	3277	41
history of etch a sketch	0.88	1	368	48