H.orientalis with popei-like trait?

[Jesper]

I had a bunch of larvae a while ago and now that they have morphed I am noticing that several of them have whitish patches on their backs kind of like popei. One of them is virtually covered in these whitish patches... They are all pale brown rather than dark brown / black like most of their siblings. I will post a photo soon... Just wondering if anyone has seen this before?

 

[Azhael]

I know this seems too basic, but you are sure it´s not air, right? xD This is definitely new to me with H.orientalis, the rather pale brown has been known to happen, but the white patches are weird stuff.
Can´t wait for the pictures.