As noted in the patent application, this rose has a tendency to produce orange-red blooms in startling contrast to its creamy yellow blooms. I have seen this on more than one plant.

'Kooiana Moonlight' is a sport of the light pink 'Gerdo', which itself sported from Kordes' orange-red 'Mercedes' and the introducers noted that this colour anomaly appears to be a reversion to the colour of 'Mercedes'.