what is the significant of the substance labelled on Bond Papers or Type writting Papers?

Answer 1

If you are asking about the watermark, it's a way for the manufacturer of a high quality paper to identify his product. It's also a way for the user of the paper to convey the message that they care enough about their communication and about the recipient to use a high quality paper product. They are sometimes used on important documents as an additional confirmation of authenticity.