It sounds to me like that is not allowed. According to the Curltalk Rules and Guidelines.....
"SPEAKING OF COMMERCIAL FREE...DON'T CONDUCT BUSINESS! Please do not post web addresses (also known as "URLs"), banners, links, or the like in your signature or in posts. The Community is for your personal, noncommercial use. It is not a forum for advertising merchandise, promoting your commercial website, soliciting sales of products or services, linking to your online store, or otherwise conducting business. This prohibition applies to your business as well as the businesses of family, friends, acquaintances, and other third parties. And it applies regardless of whether you promote the business in the signature, in posts or anywhere else."
3a (protein sensitive)
Fine, normal porosity, normal elasticity