Examples from the Web for purpurin
The same operations have also another end--to transform the purpurin into its hydrate, which is brighter and more solid.
These chemists isolated two compounds which they named alizarin and purpurin.Coal|Raphael Meldola
The Purpurin, like some of the murices, when mutilated, exude a reddish-purple fluid.The Sea-beach at Ebb-tide|Augusta Foote Arnold
Madder contains two closely allied colouring matters, namely, alizarin and purpurin.
We may remark that purpurin has not been obtained by direct synthesis.