1 In general, the total dissolved solids concentration is the sum of the cations (positively charged) and anions (negatively charged) ions in the water.  Parts per Million (ppm) is the weight-to-weight ratio of any ion to water.
If you refrigerate the rice, and you want to eat it cold, its perfectly fine. People eat cold rice salads all the time. Cold rice pudding is fine. Its just sitting around at room temperature that is the problem.
Hi. Can anyone give a proof on the temperature increasing factor from taking rice out of the fridge and leave it at 20 deg C. Would like to know the threshold when it is considered as a threat to eat for getting food poisoning.