UN-Floating Blue my efforts,it snot as easy as you think

I am also keen to develop a floating blue which will work for me..
I did put in a couple of tests..but resulted in snot green and an almost floating blue

FLOTBLUEBRUNNERROY NZ C6 APPROX
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Cone 6 1201 deg.C. -
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Ferro 4108 40.72
Feldspar GL/AP-240 34.32
NZ China Clay 19.18
Magnesium Carb Light 1.82
Silica 3.93
Cobalt Carbonate 2.00
Red Iron Oxide 2.00
Rutile 3.75
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Seger
KNO 0.440
CaO 0.474
MgO 0.087
Al2O3 0.543
B2O3 0.436
SiO2 3.703
TiO2 0.182
K2O 0.161
Na2O 0.279
Al:Si 6.82
Expan. 10.63
ST 335.06
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Rutile-3.75 up to 4. it says do a line blend we use 3.75 works for us!
Cindy Gatto & Mark Petrin
http://www.potters.org/subject90338.htm/