Furthermore, its cost effectiveness should be mentioned.An average of about250ppm of 2-Bromi-2-nitro propane-1,3-diol makes the control of bacteria very cost effective. The cost to preserve one pound of cosmetic product against bac-teria is only about 0.15 cent (0.33cent/kg).With an appropriate and compatible fungicide,even in the worst case, the cost will stay below 1cent/Ib(2.2cent/kg).