What paper weight is best for cyanotype?

For cyanotype, aim for paper of at least 300 gsm, ideally 640 gsm for large formats. A high weight prevents the sheet from buckling and disintegrating during the long water rinses typical of alternative processes. Below 300 gsm, the paper warps in the tray and the print becomes hard to handle. 100% cotton withstands these washes better than cheap cellulose.

Why avoid optical brightening agents in paper?

Optical brightening agents (OBAs) are fluorescent whitening compounds added to many papers to make them appear whiter. They react poorly with the iron salts of cyanotype, causing premature yellowing and loss of contrast. For prints stable over time, choose paper explicitly free of OBAs, such as Bergger COT 320. A simple test: OBA-free paper does not glow blue under a UV lamp.

What is sizing and why does it matter?

Sizing is the treatment that controls a paper's absorbency. Over-sized (very smooth) paper prevents chemistry from soaking in and yields a pale print; under-sized paper absorbs everything and gives a flat, low-contrast result. For cyanotype, medium sizing is ideal: chemistry penetrates the surface without being fully absorbed. Quality watercolor papers like Arches offer balanced sizing suited to alternative processes.

Which paper is recommended for cyanotype beginners?

For beginners, Bergger COT 320 (100% cotton, OBA-free, 320 gsm) is a safe bet, as is a fine-grain Arches watercolor paper. These papers offer balanced sizing, good wet strength, and a neutral white that preserves the purity of Prussian blue. Ensure at least 300 gsm to avoid warping. Avoid drawing papers and cheap pads, poorly suited to prolonged washes.

Quel papier choisir pour le cyanotype et les tirages alternatifs

Choosing the correct paper is critical in alternative photography. It's the soul of your print. For cyanotypes, not all papers are created equal.

Criteria for a good paper

100% Cotton or pure Cellulose: Avoid cheap drafting papers. Cotton holds up perfectly during the long wash cycles necessary in alternative processes.
Sizing: A paper with too much internal or external sizing will prevent the chemistry from soaking in properly. A paper with no sizing will absorb everything, leading to a flat, low-contrast print.
Zero tolerance for Optical Brightening Agents (OBAs): These bleaching chemicals react poorly to the iron salts in cyanotype, often causing premature fading or yellowing.

Our Recommendations

The ideal paper for starting out is the Bergger COT 320, or a hot/cold pressed Arches watercolor paper. Make sure you use at least 300gsm paper so it doesn't buckle and disintegrate in your washing tray.

Quel papier choisir pour le cyanotype et les tirages alternatifs

Criteria for a good paper

Our Recommendations

Start your journey

Kit Cyanotype

Luminograph