Keyword Analysis & Research: when was chemical etching invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was chemical etching invented	0.11	0.7	7161	91	34
when	1.82	0.2	8480	65	4
was	0.09	0.9	2907	4	3
chemical	0.59	0.2	8197	1	8
etching	1.56	0.8	80	79	7
invented	1.57	0.1	5170	48	8

Keyword	CPC	PCC	Volume	Score
when was chemical etching invented	2	0.5	2211	67