กระดาษและผลิตภัณฑ์กระดาษ
เอกสารมาตรฐาน
สหรัฐอเมริกา
TAPPI
T 444 sp-21
Silver tarnishing by paper and paperboard
2021
4
offline
This practice is for identifying papers and boards that will tarnish or stain metal plates. The appearance
of the tarnish, stain, or corrosion of metal by a test specimen of the sample is reported, together with the distribution
of the tarnishing or staining. Reducible sulfur activity is a common cause of tarnishing. ....