Axanthic axolotls lack the red and yellow hues on its skin.  As a result, they appear more greyish/purplish in coloring.  They lack the "sparkly" trait.  Typically they have a "spotted" look unless they unless they are also melanoid.  Axanthicism in axolotls is a trait that can be found in several types of morphs.   However, it is also considered it's own morph!  So cool!

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Note*  The photo of the axanthic axolotl in this morph description was taken by Lloyd Strohl III.