mixed with an acid such as oxalic acid in about one minute 39 s time the temperature of the exothermic reaction caused when water and calcium chloride interact rises from a room temperature of about 19 u00b0 c to a temperature of about 60 u00b0 c which is sufficient to heat the product within the cup the radial pressure is exerted between the opposing fingers 66 as shown there are four zones one corresponding to each abutment 56 58 60 62 at which the finger pressure should be applied these zones can be highlighted and marked on the side wall 12 otherwise it is sufficient for the user to merely hold the container in his or her hand and grip tightly as if making a fist this radial squeezing is continued until resistance is felt when the side wall 12 engages the cup 14 this cup thus serves as a safety stop for preventing the user from completely crushing the arrangement a label can be applied on the side wall which not only provides sales and marketing information but also prominently displays the finger pressure zones once the recommended waiting period has elapsed the arrangement is returned to its original upright position and the pull tab 42 is pulled back to either partially or completely remove the diaphragm 40 depending upon the.