using mercury dibromofluorescein disodium salt in SNF...

Mary Tang mtang at
Tue Sep 8 12:49:19 PDT 2009

Hi Robert --

Gee, reading the MSDS, you wouldn't think this was the stuff that our 
moms used put on cuts and scrapes. But it was taken off the market for a 

First, some questions:

1. How often will this be used? Is it a one-time test or do you 
anticipate frequent use?

2. Where will this be used? Does it need to be in the yellow room?

3. How much will you use? Enough to cover one wafer or 25?

4. Is this heated or at room temp?

5. Are there any other chemicals required for this process?

6. Do you plan to store the material at SNF?


Robert Huang wrote:
> Dear SNF Specmat Committee:
> I am interested in using mercury dibromofluorescein disodium salt 
> inside the SNF facility. First question - Is it perhaps already on the 
> approved list of materials that can be used in SNF? If not, I would 
> like to ask the committee’s permission to use. My intent is to 
> dissolve the salt in DI water and submerge my 4” silicon wafers in the 
> solution in order to coat my wafers with the resulting photosensitive 
> material. Other names for this compound are:
> 1) 2’,7’-Dibromo-5’-(hydroxymercurio)fluoresceindisodium salt
> 2) Merbromin
> 3) Mercurochrome
> I’m attaching the MSDS from Sigma-Aldrich which is where I plan to 
> obtain the material. You can also obtain the document from their 
> website – <>, using 
> product #M7011.
> If any questions, please don’t hesitate to contact me.
> Sincerely,
> Robert Huang
> Director, Process and Device Technology
> QuSwami, Inc.
> 505 Montgomery St., Suite 300
> San Francisco, CA 94111
> 415-834-9910 (Office)
> 408-854-0450 (Cell)
> roberth at <mailto:roberth at>

Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA  94305
mtang at

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