Colour

Off by default. A book set in black and greys prints on the cheapest tier, and most books should.

Turning it on

Use a palette switches on six inks. Each shows its name and its hex value, and opens a colour picker.

Ink	What it is for
Primary	The brand’s main colour
Secondary	A supporting colour
Accent	Used sparingly, for emphasis
Text	The body colour
Muted text	Captions, folios, attributions
Background	The page itself

The first three are what you pick a book’s identity on. The last three are usually left alone — #111111 text on a #FFFFFF page is what the presets ship.

What the inks paint

Nothing, until you say so. Setting six colours changes not one thing on the page — an ink has to be bound to something before it paints.

Seven targets, each set to an ink or left Unchanged:

Chapter titles · Subheadings · Chapter numbers · Links · Rules and ornaments · Quotation rule · Scene breaks

This is why colour is a panel rather than a switch: a book with coloured chapter titles and black prose is one decision, and a book with a tinted page is another.

What it costs

The bottom of the panel prices your book — the real per-copy cost at its current page count, for each of the three ink tiers, with the multiplier beside it:

Black ink	the baseline
Standard colour	about 1.9×
Premium colour	about 4.5×

The figures move as the book grows, because the rate is per page.

Colour in an ebook

An EPUB carries colour at no cost, so a book can be black in print and coloured as an ebook. That is what happens automatically when you choose black ink at export: the PDF is flattened to greys and the EPUB keeps its colour.