Much has been said of the famous glazes formulated by William Grueby. The mat watermelon-green which propelled the Grueby pottery to the forefront of the arts and crafts movement was imitated by nearly every major pottery in the country, most with little success. The variegated leathery green gave the organic shapes an almost living surface, unlike most other simple glaze treatments of the time.

Rookwood Pottery created their Z-Line in response, but the mat green might just as well have been a coat of spray-paint for all of the character it bestowed upon the simple arts and crafts forms. Their shapes were more southwestern native American in design as opposed to the more organic forms of Grueby pieces, but were crisp and well made.

Weller Pottery mass produced mat green pieces with little detail, and created an interesting mat green glaze on their Bedford line. Unfortunately, being simple cast pieces they lacked any detail either, but they did succeed in creating a line that appeared to be a product of antiquity.

Roseville Pottery tried repeatedly to catch the eye of the public with a mat green product. Their first, the Chloron line, was probably their closest to Grueby. It used new organic forms, with a bit more design relief than Weller offerings. The glaze however was rather uniform and uninteresting. Egypto followed, borrowing forms from Chloron, but advancing other more ornate shapes. Some glaze treatments showed promise, but some suggest those interesting glaze examples were simple mistakes of the kiln settings and not intentional. Regardless, Roseville later produced large numbers of bland and simple forms for their mat green line, often with a crackled surface.

Owens Pottery produced hand-molded Aqua Verde pieces with interesting free-flowing forms, but the glaze was a simple flat blue-green. Hampshire pottery developed an interesting variegated green glaze with many undertones, and may have been the closest imitation of Grueby's famous Watermelon green glaze ever produced. Wheatly copied their forms closely, Teco used flat green glazes on vases with architectural features, even McCoy Pottery produced their own take on mat green.

Above is an image of the glazes used by the Grueby Pottery and Grueby Faience. Few of the colors were used on pottery, being reserved for complex architectural faience constructions.