In Ceramics and Ideology Patricia Crown compared the composition of Salado polychrome sherds from across the region to prove that Salado polychromes were produced over a wide area instead of a few locations and traded widely. It would be enlightening to compare Salado polychrome composition with that of other sherds from the same site, particularly plain ware which is more likely to be locally made, to prove that it is in fact made locally.
Much is made of the composition, color, texture, etc of the paste of Salado polychromes while the white slip gets little if any attention. An analysis of Salado white slip would be most interesting, it is quite simple to scrape off the white slip and analyze it alone. Slip usually has no additives to contaminate it like paste does which is usually tempered and can be mixed with clay from different sources. Patricia Crown highlighted the similarity of color among Salado polychrome red slips and suggests that they may all come from the same source, but practically ignores the white slip which is also very consistent and a much rarer commodity than red.