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1 part of anesthetic ether (0.2%):Removes surface debries
5 parts of hydrochloric acid (36%):Etches the enamel
5 parts of hydrogen peroxide (30%):Bleaches the enamel

MODIFIED MCLNNES SOLUTION
compries 20% sodium hydroxide instead of 36% hydrochloric acid .
Since sodium hyroxide is highly alkaline in nature ,it dissolves calcium of the enamel at slower rate .
HENCE MODIFIED MCINNES SOLUTION IS CONSIDERED TO BE A SLOWER BUT SAFER ALTERNATIVE TO MCINNES SOLUTION

(Grossman)