Colorants for Enamel, Ceramic and Glass

Instructions: 
Coated colorants:
1) Melting glaze with high reflective rate enhances the color
2) An appropriate amount of PbO added in the glaze can help to increase 
    the brightness and lightness
3) Content of alkali metals should be below 5%, otherwise the stability 
    of the coated phase will be affected
4) Avoids adding ZnO2, and it is not suitable to be used with 
    zirconium emulsion glaze 
5) Content of SiO2 should be below 50%
6) Excessive grinding will affect the ability of color forming

Black series:
1) Avoids adding ZnO, otherwise it will develop a yellowish brown color
2) MgO will make color lighter 
3) Calcium based glaze will help the color forming 

Rose red series:
1) Tin emulsion glaze and lime glaze will help to generate a more 
    brilliant color with darker shade
2) Avoids adding ZnO and Al2O3, otherwise the color 
    shade will be affected 
3) The color will fade out in reduction flame 

Blue series:
1) Stable in all kinds of glaze
2) ZnO and SnO would lead the color towards violet shade
3) A small amount of Pb will lead the color towards blue shade 

Green series: 
1) Avoids adding SnO2 or mixing with colorants containing 
    SnO2, otherwise the color will be of red shade
2) Lime glaze and lead glaze will enhance the color 
3) ZnO and MgO will make the color appear brown