What was advertised in a colonial newspaper 250 years ago today?

“Having served a regular Apprenticeship to the Business, he flatters himself he cannot fail of giving general Satisfaction.”
“DALLAS, Silk Dyer and Scourer, from London” had a lot going for him and he wanted potential customers to know it. Being a “Silk Dyer and Scourer” required particular skills; novices or pretenders might end up ruining any garments turned over to their care, but Dallas had “served a regular Apprenticeship to the Business.” He had received the training necessary for his occupation. As a result, clients could trust the other claims he made in his advertisement. Dallas did not just market the services he provided or the products he sold. He also marketed himself, especially his expertise and training, much as many modern advertisers list their qualifications, certifications, or degrees when promoting their businesses.
Dallas “clean’d or dyed” a variety of textiles, sometimes seeming to work magic on them. No matter how damaged they happened to be when delivered to his shop “at the Sign of the Dove and Rainbow,” Dallas was able to remove spots and otherwise clean fabrics so “they shall look equal to any new imported.” He pledged that he did this work “to the greatest Perfection.” He was able to accomplish this in part because of his specialized training, but also because he learned during his apprenticeship that it was necessary to have the proper supplies and equipment. Accordingly, “he hath every necessary Dye-Stuff, and proper Utensils superior to any ever erected in America.”
Apparently Dallas was so skilled as a “Silk Dyer and Scourer,” a celebrity in his occupation, that he needed only one name!