Short answer
Start from the colour the recycled material naturally has and design towards it: darker, earthier, heathered and speckled finishes absorb batch variation, while very pale, clean or saturated colours expose it and need more pigment. The right choice depends on the material's baseline colour, how much variation the product can tolerate, and whether the recycled look is meant to be seen.
Every recycled stream has a natural starting colour: mixed polyolefins are grey to dark, bottle rPET is clear with a faint grey-yellow, recycled board is grey or brown, mechanically recycled wool and cotton carry the colour of their sort, and container glass is flint, amber or green depending on cullet. Designing towards that baseline costs least — little or no added colourant, no fight against lot variation. Designing away from it, for example a pure white from grey recyclate, needs enough pigment to hide the base, and every lot of base colour still shows through slightly differently. A useful first step is to ask the supplier for the uncoloured material and put it next to the intended colour.
Colour differences are easier to see in light, clean colours than in dark, muted ones. A small shift in the base material moves a pale colour's lightness and chroma noticeably, while the same shift under a dark, heavily pigmented colour is largely absorbed. Dark greys, deep greens, browns, navies and charcoal therefore give the most consistent results from recyclate, and they need less pigment to achieve full coverage over a grey base. Blacks are the extreme case — but for packaging, carbon black brings the sorting problem described elsewhere, so a detectable black or a very dark non-black is often the better choice.
Very pale tints need a white base; making white from grey recyclate needs a heavy titanium dioxide load, which costs more, can change mechanical properties and, in PET, harms clarity for the next recycler. Clean saturated colours need a neutral base to reach full chroma; a yellowish base shifts blues towards green and makes reds look brown. Translucent and tinted-clear colours are harder still, because haze and residual tint are visible straight through the material and there is no opaque layer to hide them. These choices are possible, but they should be made knowingly and with physical samples from several lots.
Some of the most successful recycled products treat variation as a feature: terrazzo-like speckle in recycled plastic sheet, visible fibres in recycled paper, heathered yarns, the green tint of recycled glass, grey reclaimed timber. This works when the range of variation is communicated and accepted up front — a sample set showing the spread rather than one golden sample — and when the product does not sit next to a precisely matched part. It fails when a speckled or tinted recycled part must match a virgin part in the same assembly, so the colour strategy should be decided per component, not for the product as a whole.
| Target colour family | Pigment demand on grey/tinted base | Visibility of lot variation | Notes |
|---|---|---|---|
| Charcoal, dark grey, navy, forest | Low | Low | Most forgiving; avoid carbon black in packaging |
| Earthy mid-tones (olive, terracotta, taupe) | Moderate | Low to moderate | Base tint often reads as intended warmth |
| Heathered or speckled | Low | Designed-in | Show the range in the sample set |
| Clean saturated brights | High | Moderate to high | Yellowish base dulls blues and reds |
| Pale tints and pure white | Very high (white pigment) | High | May need white or virgin top layer |
| Tinted clear | Low pigment, no hiding | High | Haze and residual tint show through |
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
FactModerate evidence
Opaque white PET bottles use titanium dioxide, which creates undesirable haze if it enters the clear PET recycling stream; white-opaque PET is handled as a separate stream in European guidance.
Source: APR Design Guide for Plastics Recyclability: PET Rigid; RecyClass Design for Recycling Guidelines: White Opaque PET Bottles
FactModerate evidence
Mechanically recycled textiles are sorted by shade so that they need not be re-dyed, meaning the recycled product's colour follows the colour of its feedstock.
Colourwise interpretationModerate evidence
Darker, more muted target colours tolerate batch-to-batch variation in recycled base material better than pale, clean or saturated colours, because the same base shift produces a smaller visible difference under a heavily pigmented dark colour.
Based on: Follows from how colour-difference formulas weight lightness and chroma differences, and from the recyclate colour behaviour documented in the cited recycled-plastic and textile sources.
Reviewed 29 September 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.