72 
RERAMIC STUDIO 
No. 7. Modern application of primiihe processes. Marblehead pottery. Designs in fixed colored glazes with incLsed outlines. 
TECHNICAL STUDY ON THE DECORATION OF ART The mixture must be perfectly homogeneous, conse- 
CERAMICS— (Continued) quently well gi'ound. 
Louis Franchei Another example of blue coloring: 
Inlaid Decoration Cobalt oxide 8) 
INCISED decoration has led to another process, inlaid decor- ^ """^ °'!'^'' -fl ^""^^ 
ation, that is, incisions are filled with coloring matters, i:'egmatite 50 j 
generally clay slip or ochres. One must not imagine that in- Green coloring: 
laid decoration is similar to slip painting. These two processes Pegmatite 30 \ 
give absolutely different decorative effects. And modern Kaolin 18/ 
artists could to advantage use inlaid decoration with all kinds Zinc oxide .45 fritted 
of bodies, since we know how to color the latter at will. cobalt oxide it 
Colored slips must be rich in oxides. For instance for a Chrome oxide 6 ' 
blue slip: Pegmatite 70 These examples will be sufficient to give a general idea of the 
Cobalt oxide 30 question. 
This is ground in water, fritted, ground again, then blue slips These colored slips may be used either to make the piece 
of various tones are made. If the clay used contains iron, itself, or for the inlaying. Inlaid pieces may be either glazed 
tones will vary from grey to black (especially in presence of or left unglazed. 
manganese). 
Blue slips: 
Frit as above 1 2 5 10 15 20 
White slip 99 98 95 90 85 80 
Recent application of primitive process. English slip-ware plate, about 1680. 
Inlaid decoration. The plate was made in a mould which left the 
outlines of the decoration in reUef, and the hollow spaces were afterward 
partially filled in with slips. The execution is very crude and imperfect 
and far below the fine work of the primitives. In the Metropolitan 
Museimi of Art, New Yorli. 
. Primilive processes. Precolombian pottery from Lambayecjue (Peru) 
Incised and excised decoration. Prom the Berthon collection, Paris. 
