Removing titanium from tantalum crucible I'm trying to remove titanium filling from a tantalum crucible for a high-temperature effusion cell.  I've managed to get a majority of the material out with tweezers, but some remains and is difficult to remove.  I understand that sulfuric acid will corrode titanium, but not tantalum, and was considering this as a method for extraction.

If anyone has some advice on a method to (safely) remove $\ce{Ti}$ from the $\ce{Ta}$ crucible without destroying it, I would very much appreciate it.  I am certainly not a chemist and could use some help.
Straight hydrochloric acid- Say 20% is virtually  inert to Tantalum- but significantly corrosive to titanium. If you heat it to boiling point of hydrochloric- it will eat through the titanium.   

http://www.parrinst.com/wp-content/uploads/downloads/2011/07/Parr_Titanium-Corrosion-Info.pdf
http://www.tantaline.com/Tantalum-Corrosion-71.aspx