Adding the element strontium to a color pyrotechnic mix produces a red flame; copper, blue; barium, green; and sodium for yellow. Too much or too little of the chemicals make significant changes ...

dip wire loop in hydrochloric acid to clean check that the wire loop is clean by holding in flame - if no colour is seen, the loop is clean dip a clean wire loop into a solid sample of the ...

dip a clean wire loop into a solid sample of the compound being tested put the loop into the edge of the blue flame from a Bunsen burner observe and record the flame ...