Iridescent creates a shine over the body of the Seragon like the shine on bird feathers such as a crow.
This marking sit's above all markings except for white markings.

What iridescent can do with the full body shine.
Non Dom Allowances.
Free formed cloud like shape.
Affect one full marking.

Dom
Can have both
Free formed cloud like shape and affect two full markings

This is not a sparkle gene, while some sparkles may be present to help show the shine, it must be kept at a very minimal.