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