Assertion: apatite's property | /r/HasProperty | improved
Facets:
value: by using dilute phosphoric acid
type: MANNER
Source sentences:
text: The mixture of tetracalcium phosphate and calcium hydrogenphosphate dihydrate first proposed by Brown and Chow has been continuously investigated by many researchers, and its hardening properties were improved by using dilute phosphoric acid and adding synthetic hydroxyapatite powder.