Few complaints come back faster than a shade complaint. A buyer orders 50 tonnes of yellow or pink and expects every reel to match the last. When colour drifts, the reel goes back, and the margin goes with it.
Why shade drifts
- Furnish changes – a different mix of recycled fibre changes base colour.
- Water – hardness and pH affect how dyes fix.
- Dye lot variation – not every dye is consistent between batches.
- Retention – if fines and filler drain away, so does dye.
- Dosing – manual dosing is rarely as steady as people think.
The dye families
Direct dyes
Direct black, direct red and others have good affinity for cellulose and fix without much help. They are the workhorses for coloured writing paper and kraft.
Basic dyes
Auramine, rhodamine, methylene blue and Bismarck brown give bright, strong shades – especially on unbleached and recycled furnish – at low cost.
Acid dyes
Acid orange and similar dyes need a fixative but give clean, bright shades.
Pigment dyes
Pigment dyes such as pigment blue give excellent light-fastness for premium papers.
Steps that keep shade steady
- Buy from a consistent source – same manufacturer, same grade, every lot.
- Meter, don’t eyeball – use a dosing pump and log the rate.
- Add dye early to thick stock for even mixing, and fix it with alum or a fixative where needed.
- Keep retention stable – shade follows retention.
- Check against a master sample under the same light every shift.
Use cases
- Coloured writing and printing paper.
- Kraft and packaging with brand colours.
- Tissue and napkins in pastel shades.
- Textile units for fabric dyeing.
Need dyes that match every time? Send us your shade card or a sample – we will suggest dyes and quantities. Ask about paper dyes →