Too much crotal will make the wool a dark red brown, but a very pretty terra cotta red can be got.    From Wordnik.com.  [Vegetable Dyes Being a Book of Recipes and Other Information Useful to the Dyer] Reference

The hills were bleak and barren, the rocks harsh and cold with no warm crotal on them, and just the reek from the houses rising into the frosty sky.    From Wordnik.com.  [The McBrides A Romance of Arran] Reference

Known collectively as crotal bells.    From Wordnik.com.  [Beyond Meds] Reference

'crotal' meaning a rattle or castanet.    From Wordnik.com.  [8: Plant protection and pest control] Reference

"crotal, 19.    From Wordnik.com.  [Vegetable Dyes Being a Book of Recipes and Other Information Useful to the Dyer] Reference