The Alkaline Earths
21. Barium, BaO.—In the Bunsen flame on the platinum wire it imparts an apple-green coloration. This reaction is intensified by moistening the sample with hydrochloric acid.
22. Calcium, CaO.—In the Bunsen flame on the platinum wire it imparts an orange-red color, which appears gray when seen through blue glass.
Hydrochloric acid on the sample makes the color more intense.
23. Strontium, SrO.—In the Bunsen flame on the platinum wire it imparts an intensely red color, which is increased by converting the substance into the chloride.