Mullers are hand made of solid glass for mixing paint pigments.

Mullers are used by the artist for mixing pigments including tempera, acrylics,and oils.

Handmade Watercolour Paint Shimmer, Metallic, Colour Shift

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

Glass Muller for Making Paint, 1.9 inch Watercolor Muller Flat Bottom Mineral Pigment Grinding Pestle Homemade Paint Tools for Watercolor, Oil

Color: Transparent, Material: Glass, Size: See Photo, Package Includes: 2 x Glass Muller, Note:, - Please refer to the measurement. Tiny measuring

Glass Muller for Making Paint, 2pcs 3-inch and 5-inch Watercolor Muller Flat Bottom Mineral Pigment Grinding Pestle Set for Making Paint, Oil

The flat-bottomed paint muller is an indispensable tool for homemade natural mineral pigment oil paints, tempera paints and thangka paints. It is suitable for artists and painting enthusiasts who have strong individual requirements for pigment performance. The grinding surface is frosted, suitable for use with tempered glass grinding plates or palettes. It is convenient to collect the ground paint or use it directly, and it is easier to clean up after work.

Glass Muller Flat Bottom Mineral Pigment Grinding Pestle Set for Making Paint, Suitable for Oil Painting, Watercolor,tempera, Thangka

How is paint pigment made? - Quora

Paint Muller(2.95 in),Glass Muller for Making Paint

Color: Transparent, Material: Glass, Size: See Photo, Package Includes: 1 x Glass Muller, Note:, - Please refer to the measurement. Tiny measuring

Glass Muller for Making Paint, 1.9 Inch Watercolor Muller Flat Bottom Mineral Pigment Grinding Pestle Homemade Paint Tools for Watercolor, Oil

Glass Muller, Large 3.22 in diameter x 2.75 in tall ? New York Central Strong, break-resistant, tempered glass! Artisans have been making paint with mullers or pestles for thousands of years. Making your own paints gives you control of the creative process from start to finish. New York Central Glass Mullers are perfect for mixing ground pigments with oil or water-based binders. Available in two sizes, each muller is made of strong, break-resistant, tempered glass.

New York Central Glass Muller Medium, 3.2 Diameter