Fig. 5
When the chocolate is warm it is thin, but by the time it has cooled enough it will be thick enough not to run off the center. You must continue working the mass of chocolate until the heat has all left it. There are several ways of telling when it is cooled enough.
For a beginner, we might advise you to use the thermometer until you have had a little experience. Slide the scale with the glass on, out of the case, so that the chocolate will cover all of the bulb, and after you have worked it for about five minutes, stand the thermometer in the center of the mass of chocolate until the mercury stops rising. If it registers about 82, it is then ready. If it is higher, continue working until it has reached the required degree. In cool weather the chocolate may be cooled sufficiently in from five to eight minutes, but in warm weather it may even take as long as twenty minutes. After you have used the thermometer a few times, you will know just how cool the chocolate should be, and then you can get along without it.
Another way to tell when the chocolate is cooled enough is, when you have worked it for five or six minutes, and it seems cold to the hand that is in it, simply dip the back of the fingers of the other hand in the chocolate, and if it is in reality cold, or you are sure the heat has all left it, then dip a piece or two, and cool them quickly, and you can soon tell. The chocolate has a high gloss, and retains the markings if it is cooled sufficiently.