In this method, we are basically Mimiting ourselves to the use of two materials, In the second method, we use up to four materiƩls, thus giving a much wider range of possibilities, The method is as follows:- Take four materials, A = Any Frit B = Any Clay C = Any Flux D = Flint These are added together in increasing and decreasing amounts, in each case making a total of 100. A look at the chart will show the way it works. The left-hand side of the square, A-H, accounts for decreasing amounts of A, with 8 remaining constant, The bottom of the square, B=-C, accounts for decreasing amounts of B, with C remaining con- stant. The right-hand side of the square, C-D, accounts for de- creasing amounts of C, while D remains constant. The top of the square, D-A, accounts for decreasing amounts of D, while A remains constant. See The following page of numbers refers to the crossing points of the lines, and I hope it is reasonably easy to understand. For example, let us take Point No. 21. Looking down the line A-B, we find thet No. 21 is on the line which contains 20 parts of A, Looking across the line B-C, we find that it falls on the line which contains 30 parts of B. Looking up the line C=-D, we find that it falls on the Line con- taining 30 parts C, and locking across the top line, we find it contains 20 parts of D. Therefore, Mixture No. 21 contains: FRIT Z0 CLAY 30 FLUX 30 FLINT 20 Apply mixture to a test tile of whatever clay you normally use. Tile approximately l=-1/2" x3", At one end, make strokes alternately in IRON, COPPER, and COBALT over the glaze mix. Fire at cone 04, This will give you some idea of the effects varlous colourants will make. ian