Spoil and level gap

I know that mobs have a lowered chance of turning blue when they con light blue or darker, but I'm wondering if the same holds true for pink mobs or if I just had some really horrible luck yesterday. :p

Its just mob spoil rate, its hard to get spoil from dark blue mobs, light blue,white,yellow are normal spoilable, about red mobs is just spoil rate and how much higher is mob, its like this if u are lvl 70 bh u can get spoil from lvl80 mobs in imperial tomb and imposible to spoil somewhere else on 80 mobs, so its more rate than anything else but much difrance of lvls lower rate.

Think of it like this:

Red Mob : Spoil Chance 1%
Pink Mob :Spoil Chance 5%
Yellow Mob : Spoil Chance 10%
White Mob : Spoil Chance 50%
Green Mob : Spoil Chance 50%
Light Blue : Spoil Chance 25%
Dark Blue Spoil Chance 1%

This is just an example, also depends what mob ure spoiling. Some items spoil 100%, others 0.00000000000001%