Nitram Sharpening Bloc UV Resistant Clear Matte The Cotman 21ml tube provides

The Cotman 21ml tube provides excellent value and generous volume for studio use

and fine artists who want the flexibility of both water‑soluble colour and permanent ink

designed for all stages of oil painting

237ml | 473ml | 946ml

Nitram Sharpening Bloc UV Resistant Clear Matte The Cotman 21ml tube providesNitram Sharpening Bloc The Nitram Sharpening Bloc is an essential studio tool for artists who want precise control over their charcoal points. Designed for use with Nitram Fine Art Charcoal, this sharpening surface allows you to shape sticks to a needlefine edge or create broad, flat planes for expressive markmaking. The durable abrasive surface provides consistent, even sharpening without the mess or fragility of traditional sandpaper blocks. Ideal