Choosing paper for high-resolution PDF colouring books

A PDF plate is only as good as the paper it lands on. The same 300dpi file printed on inkjet-receptive 250gsm cotton rag and on standard 80gsm office copy paper are essentially different objects — the first holds dense colour without buckling and rewards layered pencil work for hours; the second tears, shows ink-bleed within the first wash, and warps the moment a watercolour brush touches it.

For anyone printing the plates in this catalogue (or any high-resolution PDF colouring book) at home, the paper choice matters more than most. This is a short guide to the variables and the recommendations.

The four variables that matter

1. Weight (gsm)

Paper weight is measured in grams per square metre (gsm). Higher gsm means heavier, thicker, more substantial paper. The relevant range for colouring work is roughly:

• 80-90 gsm — standard office copy paper. Too thin for any wet medium and too thin even for layered coloured pencil. Pencil pressure will show through to the back and the page will buckle.
• 120-160 gsm — entry-level drawing paper, sometimes sold as "sketch paper" or "drawing paper". Acceptable for light coloured pencil work but still too thin for markers or any wet medium.
• 180-220 gsm — what most premium colouring books use as their internal pages. Good for coloured pencil, oil pastel, and light marker work. The minimum recommended for the plates in this catalogue.
• 250-300 gsm — proper drawing card. Holds wet media without warping. Heavy enough that pencil pressure makes a satisfying mark without showing through.
• 300-400 gsm — watercolour or pastel paper territory. Overkill for casual colouring; ideal for serious work in mixed media.

For folio-scale plates rendered at 300dpi, the recommended minimum is 180 gsm. The sweet spot for most home printers and most colouring tools is 250 gsm.

2. Surface finish

Paper surfaces are described as hot-pressed (smooth), cold-pressed (slight texture), or rough (heavy texture).

• Hot-pressed (smooth) — best for fine line work, detailed coloured pencil, ink, and digital workflows. The lack of texture lets the pencil tip move freely and pick up every line of the printed plate underneath.
• Cold-pressed (slight tooth) — the most versatile finish. Holds coloured pencil layers well without feeling slippery; takes light watercolour washes. Most premium colouring papers fall here.
• Rough — too much texture for fine plate work. The surface fights against picking up detail in the underlying print.

For the plates in this catalogue, hot-pressed or cold-pressed are both good. Avoid rough.

3. Colour (white vs cream/bone)

Most colouring paper is sold as "bright white" or "natural white". The plates in this catalogue print on either, but the cream/bone tone of natural-white paper (around 90-95 brightness, slight warm cast) better matches the editorial design of the plates themselves and creates less visual fatigue during long colouring sessions. The bright-white papers (100+ brightness with optical brighteners) read cooler and can feel clinical under indoor light.

A small but meaningful preference: papers labelled "natural" or "warm white" generally pair better with the plates in this catalogue than "bright white" or "ultra white".

4. Acid-free / archival rating

Look for "acid-free" or "archival" on the packaging. Non-acid-free papers yellow and become brittle within a decade. Acid-free papers hold their colour and structure for fifty years or more under normal storage conditions. For work intended to be kept, archival paper is the only sensible choice. The cost difference is small — usually a few cents per sheet.

A4 versus A3 — printing larger than the file

The plates in this catalogue are designed at A4 folio scale (210 × 297 mm). They will print at their intended size on standard A4 paper using any inkjet or laser printer at home.

For colourists who prefer to work larger, the plates can also be printed at A3 (297 × 420 mm) on an A3-capable printer. The line quality holds because the files are at 300dpi at A4, which is roughly 215dpi when scaled up to A3 — still within the resolution where line work prints cleanly without visible pixelation.

Going larger than A3 (to A2 or beyond) starts to show pixelation around the finest line work. Not recommended.

A practical recommendation

For most colourists printing the plates in this catalogue at home, the most-bang-for-money paper choice is:

• 250 gsm
• Hot-pressed or cold-pressed finish
• Natural / warm white
• Acid-free
• A4

In Australia, paper meeting these criteria is widely available at art supply stores such as Eckersley's and Art Shed, and at some larger stationery chains. Specific products that fit include Strathmore Bristol Vellum, Canson XL Bristol, and Daler-Rowney Heavyweight Cartridge — though dozens of equivalent papers exist under different brand names.

A note on the printer itself

The paper is half the equation. The printer is the other half.

• Inkjet printers generally produce better colour reproduction and cleaner line work for fine plates than laser printers. The disadvantage is per-page cost: inkjet cartridges are expensive and colouring work doesn't usually need their colour capability anyway, since the plate is printed in black line only.
• Monochrome laser printers are the most economical choice for plate printing. The toner produces crisp black lines with no risk of ink-bleed from any coloured medium applied later. A reasonable home laser printer prints a plate for roughly two cents.

For most users printing primarily black-line plates and adding colour by hand afterwards, a monochrome laser printer on 250 gsm cold-pressed paper is the most cost-effective combination. The plate prints clean, the paper holds the colouring without warping, and the per-plate cost is low enough that mistakes don't matter.

On not printing

For colourists working digitally — an iPad with Apple Pencil, a Surface with stylus, a Wacom tablet — the question of paper doesn't arise. The 300dpi files in this catalogue scale cleanly onto a 12-13 inch tablet at near-life size and behave identically to a hand-on-paper workflow with the additional convenience of layering, undoing, and exporting. The same plates work in both contexts; the design intent was always that they should.

The plates in this catalogue — across Banksia Folio, Federation Terraces, Leadlight Folio, Specimens Folio, Modernist Folio, Rockpool Folio, and Wildflowers Folio — are delivered as A4-sized PDFs at 300dpi, printable on any home printer that handles 250gsm paper.