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<http://webisa.webdatacommons.org/prov/455762477>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/117511553> .
<http://webisa.webdatacommons.org/117511553>	<http://www.w3.org/ns/prov#value>	"The emulsion is then etched with a chemical, such as an acid." .
<http://webisa.webdatacommons.org/117511553>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .