How long is this gonna take me..

I'm trying to get R+R+B on dex/INT based claws (bloodseekers). Would anyone by chance be able to figure out the chances of me getting it is? Out of 255 Chromes i got two R+R combos. Thank you, i'm just looking for some hope knowing that this is achievable.
Use Verici's crafting table??
use the vorici chromatic calculator tool
http://siveran.github.io/calc.html

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