Heat a to 90-95'C; heat b to 90-95'C. While mixing a, slowly add b. While stirring, slowly add c, which has been heated to 85'. (The phenacetin is previously dissolved in the water at 90-95'C with stirring.) Dissolve d at room temperature and add this cold to the warm emulsion. continue stirring while rapidly cooling. Around 35-40'C add e. At 25'C slowly add f. After addition of the hydrogen peroxide, continue stirring for about 5 minutes.