Assertion: enamel | /r/MadeOf | silica
Facets:
Source sentences:
text: The enamel is made from silica, niter, and lead oxide to which metallic oxides are added for coloring.
text: The enamel is made from silica, niter, and lead oxide to which metallic oxides are added for coloring.
text: The enamel is made from silica, niter, and lead oxide to which metallic oxides are added for coloring.
text: The enamel is made from silica, niter, and lead oxide to which metallic oxides are added for coloring.