User blog comment:Nyastara/New Lumina Dragon Sprite Discovered/@comment-5188401-20120611222508

They simply lose there scales when now bred with Waterhorses or Turpentines. They grow there scales in a time limit of 24 hours after there last breed with the two dragons.

It is ALSO stated that only if you are able to succesfully breed your Lumina or a No Interest it will lose its scales.