Hello, You can try etching Ti with transene's TFTN. It has HCl in it, which doesn't attack GaAs. Deepa Brad Cantoswrote: Yes, this is a very strong GaAs etchant. Brad On 9/26/06 7:02 AM, "ahajjiah@vt.edu" wrote: > Vinay, > Does this etch etch thourgh GaAs or AlGaAs? > Ali > > > Quoting Vinay : > >> Hi Ali, >> One possible recipe to etch Ti is: >> 20H2O(DI) : 1HF : 1H2O2. _______________________________________________