Assertion: calcium oxide's amount | /r/HasProperty | added
Facets:
value: precisely
type: MANNER
Source sentences:
text: An important condition of getting highly efficient phosphors is that these sulfides must first be prepared to the highest possible chemical purity before the necessary amount of activator can be added precisely.
text: Only small amounts of wood ash and limestone materials were added to improve the color and melt of the glaze.