What is semi-porcelain in Johnson Brothers products?

Semi-porcelain refers to a type of ceramic developed to combine the look of porcelain with the strength of earthenware. Johnson Brothers used this method to create tableware that appeared refined yet resisted everyday wear. The process involved adjusting the clay mixture and firing conditions to achieve a dense, smooth finish. This material became a defining feature of their products. It allowed the company to offer affordable alternatives to fine china, which often cost much more. By the early 20th century, semi-porcelain had become central to their production strategy. Customers valued its balance of style and durability, which supported steady sales across different regions.