Grinding pure blue pigment from Azurite
This time last year, I bought a small lump of azurite from the Lapidary shop in Burslem, Staffordshire. I made a start at grinding it up in a pestle and mortar but since I didn’t need it at the time, saved the last stage of fine grinding to a powder with a glass slab and muller till later – ie now.
I am working on a triptych (see previous post) where I would like the two standing angels to be painted in a heavenly sky blue so it’s been back to the grindstone to extract this gorgeous colour.
Aidan Hart, demonstrated how to grind Azurite during class last year which I filmed. You can watch the process over here https://www.youtube.com/watch?v=y-FHvAxwg9w. It is an amatuer video so not very good quality, but it captures the process.
This was last years work, crunching up the rock with a small hammer. It’s surprisingly enjoyable as you see the blue emerge.
I bought a slab and muller from Patricia Lovett at her Gilding and Traditional Illumination Skills workshop some years ago. It really has come into its own now as I still have malachite, haematite and chrysocolla to grind up.
I placed about a tablespoon of pre-ground up pigment on to the slab and added just enough water to make a paste then ground it up, clockwise and anti clockwise, scraping the pigment back into the middle until the paste glides smoothly under the muller.
Pigments at last! Samples show mine on the left and the darker pigment of a pre-bought pigment on the right.
This took the best part of a morning but I’ve made enough pigment to easily last me a year or longer. Next post will hopefully show some of this azurite in use on my triptych.
Thanks for reading,
Ronnie