Upon further heating, they gradually soften, which can be characterized by certain softening points. Air pockets can allow sweat to accumulate that can soften the skin. The acetone condenses evenly all over the part, causing the surface to soften and liquefy. It is then soaked in lime for several days to soften and remove the hair. Different size bars either soften or stiffen the suspension. It has a tendency to soften in warm temperatures and "heal" itself. The effect is to soften the note as well as change the tone. It is often desirable to soften hard water. Citric acid is used to soften water in soaps and laundry detergents. Sodium bicarbonate is sometimes added to soften the peas. It is also used to distribute saliva to soften solid foods or collect loose particles. An occasional bath will not soften the coat too much. These events mellowed Adams and caused him to soften his outlook. Misoprostol can be used to soften the cervix further. Sodium carbonate is used to soften water by removing Mg and Ca.