Even when you change for the Legendary Dye. 90% of the time you will get MEN, WIT and CON Dye (Esp MEN Dye, probably like 70% rate).
The odds of getting DEX Dye is like for, every 30 Suspicious Safe, you will only get 1 DEX Dye.
If you need 30 DEX Dye, you will prolly need 900 Suspicious Safe. What a waste of $$$.
If you need any DYE, just sell your Suspicious Safe and buy the DYE with adena.