Safflower may be easily recognized by its color being discharged by caustic potash or soda. Madder colors when treated with hy- drochloric acid, acquire a yellow or orange tint without any shade ...

The residue in the retort was shaken with a few drops of a solution of caustic potash and about an ounce of ether. The etherial solution evaporated on a watch glass gave a mass in which the ...