Glass Mullers Grinding Slabs

Parkers is renowned as an inspiring artists treasure trove for it
Pigments need to be bound to become a paint. For complete dispersion of the pigment in its binder the use of a muller and slab is essential for maximum durability and performance of the finished paint. Langridge supplies paint making and storing equipment for the home manufacture of artists colours.
The Lukas glass mullers are an essential tool for the paint-maker. It has a classic shape, a tall handle, and a sandblasted face for mulling pigments. Available in two diameters: 100mm, and 60mm.  
Art Spectrum's glass mullers are hand-made in Italy, with the Art Spectrum logo etched into the glass.

Mullers are used to grind pigment to a floury consistency, for mixing in a suitable oil or medium. In order for a pigment to color the medium richly

Roberson : Professional Glass Muller : 10cm : For Mixing and Grinding Pigment

Glass Muller, large Mortars & Pestles, Glass Mullers

Making Your Own Paint Grinding Slab - Jackson's Art Blog

Tempered Frosted Glass Paint Muller Slab(0.4'' Thick), Pigment Grinding Plate, DIY Oil Paint Watercolor,Used with Glass Muller

Small Glass Mullers and milling slabs by Art Boards™ Archival Art Supply.

Paint Muller Set for Making Paint, Glass Muller Set for Homemade Pigment,Suitable for Oil Painting, Watercolor,Tempera

Glass Mullers for grinding paint pigments

Art Boards™ Medium Size Glass Mullers and Slabs for Mixing Artist Pigments with oil or water.

New York Central Glass Mullers & Grinding Plates

Muller for grinding hi-res stock photography and images - Alamy

Making Your Own Paint Grinding Slab - Jackson's Art Blog

Art Boards™ Large Glass Muller

Roberson Glass Mullers - Equipment - Pigments Gums & Resins