>Try Aqua Regia. The composition is HCl: HNO3:H20 = 3:1:4
>
>> ----------
>> From:        Andrew CAMPITELLI[SMTP:campi@lpmo.univ-fcomte.fr]
>> Reply To:    Andrew CAMPITELLI;mems-cc@ISI.EDU
>> Sent:        Monday, February 16, 1998 10:54 PM
>> To:  MEMS@ISI.EDU
>> Subject:     transparent Au etchant...
>>
>> Dear Colleagues,
>> I am searching for a supplier for a gold etchant that is transparent
>> (clear).
>> We are currently using a KI solution, which works well but has the major
>> disadvantage of being non-transparent.
>> Any suggestions would be greatly appreciated.
>> Thank you.
>> Andrew
>>
>>
>>