1P-LSD, one of novel lysergamides, is known to not react with the Ehrlich reagent within the expected time frame (minutes). Despite that, some users report that their samples do in fact turn Ehrlich reagent pink / purple.
How to test DMT: if you intend to use DMT, first you need a DMT test kit to check it for adulterants. Pure DMT can look white, brown or tan, and can’t be identified by appearence. To test DMT use reagent tests Ehrlich, Hofmann, Marquis and Mecke in single-use or multiple-use test kits. To detect fentanyl or test for fentanyl analogs it’s recommended to use fentanyl test strips.