IRTF/SpeX data comparing the 2019 outburst spectrum (upper, magenta) with a version of the 2003 faint-state spectrum (lower, purple) that has been scaled (by a factor of 50) and shifted (individually in each panel). In the faint state, LkHα 225 South exhibited relatively weak atomic emission features but strong molecular emission from H₂ (labeled as 2-1 or 1-0) and CO bands. During the brightening from 2003 to 2019, the LkHα 225 South infrared continuum has become bluer though it is still extremely red on an absolute scale. The line-to-continuum ratio of the weak atomic emission has increased, while the line-to-continuum of the previously prominent H₂ lines has become weaker; the CO line-to-continuum appears relatively unchanged.