More information provided by NAU American Southwest Virtual Museum: 

Tonto Polychrome is one of the most common types of Roosevelt Red Ware and was widely distributed across the Southwest, but most abundant in the Roosevelt Basin and in the vicinity of Globe, Arizona.

Archaeological Culture: Salado

Date Range: A.D. 1300-1450.

Construction: By coiling.

Firing: In an oxidizing atmosphere.

Core Color: Brick-red, tan, gray to black.

Temper: Moderately abundant fine water-worn sand.

Carbon Streak: Common.

Surface Finish:

• Bowl interiors: well-smoothed, coated (usually all over) with thick (creamy white) slip, unpolished, somewhat gritty, often crazed, rarely (white) slip covers band extending from rim downward two to three inches, remainder area coated with red slip.


• Bowl exteriors: coated in part with white slip, in part with red slip, latter usually fairly well polished.


• Jar interiors: well-smoothed, Jar exteriors: same as bowl interiors.
  Surface Color: Bowl and jar exteriors, red in part, white in part; bowl interiors creamy-white.

Forms: Bowls, jars.

Decoration:

• Paint: Black: dense, thick; Red: bright, almost maroon, fairly thick; White: thick, dull, often creamy white or light blue-gray, often flakes off.


• Pigments: Black: carbon, red: hematite, white: kaolin.


• Design: Usually completely covers bowl interiors and carries to rim, in few cases where white slip is applied only to portion of interior area, black decoration limited to white portion; very rarely red and white in combination on interiors in same manner as on exteriors; horizontal black stripe sometimes broken, frequently on bowl interiors, either at rim or about half way down side; bowl exteriors first painted in large irregular areas with white, then heavy black elements over white, leaving white visible around edges of black outline; the rest is red in areas not already covered in white; net effect balanced patterns of white and red, sometimes in angular masses, sometimes in scrolls, sometimes in panels or bands of one color separated by stripes of other color; black always used against white background, never against red background; pattern almost wholly of stripes and large, solid elements, often with scalloped or serrated edges, sometimes producing almost negative effect; hachuring rare; painted zone never extends much below greatest diameter of body; red below that point, where used as part of painted design; jar exteriors similar to bowl exteriors, red most frequently occurs in one or two encircling stripes, dividing surface into two or three bands of white on which is superimposed black decoration; brush work free, bold and rather careless.

Comparisons: Pinto Polychrome, horizontal stripe or broken line never occurs, red never used as integral part of the design. Gila Polychrome, red never used as integral part of design, brush work somewhat better executed.

Oppelt (2007:32): "Tonto Polychrome, AD 1350-1400. This type may be considered a variety of Gila Polychrome or a separate type. It is distinguished by the use of ~ed as an integral part of the designs on jar and bowl exteriors. The black-white designs on the exterior are surrounded by red areas. The designs are bold and lack hatching. The colors are the same as on Pinto and Gila Designs usually cover the bowl interior and go to the rim. It can be distinguished from Pinto Polychrome which never bas a lifeline and does not use red as an integral part of the design. Gila Polychrome also does not have red as an integral part of the design. In addition to the three Salado Polychromes described above, there are three other types of Salado Red Ware described and illustrated by vessels in this volume."

"Tonto Polychrome was defined by Gladwin and Gladwin (1930). This type exhibits treatments and styles similar to those noted for Gila Polychrome, but is differentiated from this type by incorporation of designs in red pigment on jar and bowl exteriors (Crown 1994; Lindauer 1994; Wilson 1998; Young 1982). Designs on Tonto Polychrome incorporate red slip into exterior designs. In contrast to the broad black-on-buff bands characteristic of other Salado Polychrome types, segments of black-on-buff designs are surrounded by large red slipped areas. The black organic band and red slip noted in Tonto Polychrome is similar to that noted in Gila Polychrome. Designs are bold and usually lack hatching. The dating of Tonto Polychrome appears to be similar to that noted for Gila Polychrome, although some contexts have yielded assemblages with Gila Polychrome but without Tonto Polychrome, all assemblages from which Tonto Polychrome have been recovered also contain Gila Polychrome, and suggest a slightly later beginning date for Tonto Polychrome. This may indicate that vessels assigned to Tonto Polychrome were produced sometime after A.D. 1350 but before A.D. 1450." (Dean Wilson 2012 - Southwest Ceramic Typology Project)