Since 2013, some blotter and liquid "acid" being sold in the Americas and Europe contains NBOMe compounds instead of LSD. The NBOMe chemicals can cause strong effects even on a single standard hit of blotter (1/4" (6mm) square). Unlike LSD, NBOMes can cause death. NBOMe compounds are usually bitter while LSD-containing liquid or blotter has only a mild metallic flavor or no flavor at all.