Thank you for the super fast and helpful answer!
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
At least we have a solution! That's great.
I was thinking, would it be easier to just copy the private key of the colored one and import it in mastercoin supporting web wallet, and spend it there to another address i control.
Then the copy in armory will be unusable, right?
If I spend something from this wallet right now I guess there is big chance it will spend the colored coin, right?
Technically you could request payments to that address in Armory, but you'd have to explicitly ask it to. Otherwise it will always use the next address in the chain and ignore old ones for receiving. Spending, however, will happen. If you keep receiving colored coins to that address, Armory will keep adding them to the pool for spending. The only way to leave them untouched but use your other coins is to simply switch to a new wallet and move all those coins there. Then you can treat the original wallet as a kind of mastercoin watch-only wallet (technically you can spend them, but it sounds like you won't be)