200 s u2212 1 is between 50 and 2 000 mpa u00b7 s as it is usual in the field all the viscosities reported in the present text were measured with a haake rotational rheometer the viscosity measures were performed through flow curves at u201c controlled shear rate u201d between 1 and 200 sec u2212 1 six concentrated mediums in powder form are prepared by firstly preparing the glycol absorbent mixture and then by adding urea and the other ingredients a comparative dry medium is prepared by homogenising a high molecular weight glycol peg 6 000 with urea and the other ingredients the composition of the mediums is reported in table 1 where the ingredients and their dosage are indicated wt seven powdery dry ceramic ink compositions were prepared by mixing in a mill each of the mediums prepared in example 1 with a mixture of ceramic pigments in the proportion by weight indicated in table 2 the ink composition i1 is prepared from the medium 1 the ink composition i2 from medium 2 and so on the ink compositions i1 i2 i3 and i4 were then diluted with 50 parts by weight of water while the ink compositions i5 i6 and i7 were diluted with 40 parts by weight of water to give seven stable ready for use liquid ceramic inks respectively li1 li2 li3 li4 li5 li6 and li7 the viscosity and stability of the liquid ceramic inks are reported in table 3 the viscosity vp 0 is the average viscosity in mpa u00b7 s measured within 1 hour from preparation of the.