Talens 063 Charcoal Fixative 1000 ml FOFS Is the hardcover rigid enough

Is the hardcover rigid enough to write on without a desk

and on the other hand

Format: A5 — 145 x 210 mm — 123 numbered pages

Suitable for both indoor and outdoor use (rain proof)

Talens 063 Charcoal Fixative 1000 ml FOFS Is the hardcover rigid enoughUnlike the 061 pastel formula, the Talens 063 is built to slightly darken and deepen what it's sprayed over because charcoal and graphite particles absorb the liquid quickly, the fixed areas come out a touch more transparent and contrasty than they looked dry. That's useful for charcoal and heavy graphite work specifically, where it adds visual depth rather than just locking the dust in place. It still does the core job too: binding loose carbon