Does this product need fixing when dry?
Thank you for your enquiry.
The decision to fix a medium is often done as a personal choice.
So will choose not to fix dry medium as it can alter the colours.
The Nitram Liquid Charcoal is fine charcoal powder in a Gum Arabic binder and preservatives with make this a very different medium to traditional charcoal.
It is a wet medium and once dry is fairly stable and not a prone to smudging as a traditional charcoal.