Wash all fruit in several changes of cold water. Lift the fruit out of the water each time. Do not let the fruit stand in water. The method of juice extraction differs with different kinds of fruit. Juicy berries may be crushed and the juice pressed out.
Heating is needed for firmer fruits to start the flow of juice.
Usually some water is added when the fruit is heated. Put the prepared fruit in a damp jelly bag or fruit press to extract juice. Pressed juice should be strained through a double thickness of damp cheesecloth or a damp jelly bag. Add softened gelatin, stirring to dissolve. Add liquid sweetener, lemon juice, and coloring.