what AES is using?  they are in singapore and rather well  
established.  I am sure they have the source of proper ESD gloves.
IMHO.
jk
ps.  Dr. William Chen if he still at AES would be the best to know it  
all.  (you might want to track him via ieee if he is still active).
On Jan 14, 2020, at 6:34 AM, Tan Geok Ang wrote:

> Will really appreciate advice on the following;
>
> a) how much of sulphur/calcium, etc. on gloves/ESD Mat is  
> acceptable and what level is considered harmful in handling of PCBA/ 
> module with sliver plated surface
>
>
> b) whether there are any “standards” or references for “compliance”  
> check for sulphur, and is there such measurements professionally  
> carried out
>
>
> c) What will be the impacts on the PCBA when silver plating become  
> tarnish?
>
>
> There are sulphur free gloves but it is not easily accessible/ 
> available in Singapore and it is expensive.
>
>
> Thanks.
>
>
> GA Tan