Making the mosaic Christ the Good Shepherd - Face2

In this video, I am working on the mosaic Christ the Good Shepherd, on Christ's face, second part.
The materials that I use are mosaic glass, known as Smalti.
Glue - cementitious adhesive mixed with Latex.
Handmade substrate for mosaic: • Handmade Substrate for...
Hope this is helpful.
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[@hardie2311]

Hi. What is the coloring material?