I am working on a school project and we are performing LAMP on Bacillus cereus. Currently we are working on the sensitivity of the LAMP. We have performed the experiment for 3 times and for all 3 times there were amplification for the No Template Controls while some of the concentrations still remain pink at the end of the experiment. We have already leave the NTC far away from the DNA while adding the DNA and have changed every reagents such as mastermix, primers and nuclease free water so we doubt its contamination. The reagents except for the DNA were all added in a flow hood. Can I ask if there is any other possible problems?