Hi Technetters,

        I certainly agree with Rudy.  Don Ball has done loads of work and
presented a number of papers along this line. The last phone number I had for
him was (708)238-6427.

He has been a great mentor for me in the past.

Regards,
Les Connally
>  From: "<Rudy Sedlak>" <[log in to unmask]>, on 11/8/98 9:51 AM:
>  You really ought to contact Don Ball of Atotech, (Formerly Chemcut), to get
>  results of his studies on the effects of changing variables on Cupric
>  Chloride
>  etchant.
>
>  Don studied such things as changing the free acid, Copper Content (Baume'),
>  and ORP, on such things as etching speed, and etch factor, and has published
>  his results in brochures.
>
>  He is located in State College PA, do not know the phone number.
>
>  Good luck,
>
>  Rudy Sedlak
>  RD Chemical Company
>
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