Colour Masterbatch Manufacturer in India: Getting a Match That Holds

Anyone can match a colour once. Put a competent technician in front of a spectrophotometer and a pigment library and the first plaque will be close.

What you are actually buying from a colour masterbatch manufacturer is delivery number twenty looking like delivery number one, eighteen months later, after the carrier resin supply has changed and the person who did the original match has left. That is a systems question, not a skill question, and it is what should decide where you buy.

The three things that make a match repeatable

1. A retained physical master standard

The supplier should keep a physical plaque for your colour, stored under controlled conditions, that every future batch is measured against.

This matters because the obvious alternative — matching against the sample you originally sent — degrades. Your sample yellows, scratches, picks up surface contamination and drifts. Two years in, batches are being matched against a standard that is no longer the colour you approved.

What to ask: do you retain a physical master standard for my colour, and how is it stored? This is one of the most defensible practices a colour house has, and a supplier who does it will say so immediately.

2. Stated measurement conditions

A tolerance is meaningless without the conditions attached. “ΔE under 1.0” is a wish. “ΔE*00 ≤ 1.0, D65/10°, specular included” is a specification.

The formula matters because the same two plaques can give ΔE76 of 1.8 and ΔE2000 of 0.9. The illuminant matters because colours that match under daylight can separate under shop-floor fluorescent. The geometry matters because specular included and specular excluded measure different things and are not comparable.

We go through this properly in Delta E and colour tolerance for plastics.

3. Matching in your resin

The same colourant gives a different result in a different base polymer — sometimes a visibly different one. Base resin grade, MFI, filler content, regrind percentage and even the nucleating package all move measured colour.

A supplier who matches in their house resin and then ships into yours has introduced a variable between the approved plaque and your first production run. It is one of the most common reasons a production run fails against a sample that was signed off.

What to ask: will you match in my resin? Send them the actual grade you run.

Metamerism: the failure that passes the lab

Two samples match under one light source and visibly differ under another, because they are built from different pigments with different spectral reflectance curves.

This is how a colour gets approved in a lab under D65 and then fails on a retail shelf under warm LED, or why two components match in the moulding shop and separate in daylight on the assembled product.

How to avoid it: specify the illuminants the part will actually be seen under, and ask for the match to be checked under all of them. If your part sits next to a component from another supplier, the match needs to hold across both.

Batch-to-batch consistency, and what to ask for

This is the whole value of a colour supplier, so it is worth being specific.

• Release testing against tolerance — every batch measured against the retained standard before dispatch, not spot-checked
• Batch records that let a deviation be traced to a raw-material lot
• Raw-material control — pigment lots themselves vary, and a supplier who does not test incoming pigment is passing that variation to you
• A documented response when a batch is out — what happens, who is told, what gets replaced

What to ask: what is your release process, and what happens when a batch falls outside tolerance?

Pigment choice is a commercial decision too

The pigments behind a shade determine cost, lightfastness, heat stability and regulatory status.

• Organic pigments give brighter, cleaner, more saturated shades and generally lower opacity. Some have limited heat stability and limited lightfastness.
• Inorganic pigments are more opaque, more heat stable and more lightfast, in a more muted palette.
• High-performance organics bridge the gap at a significant cost premium.

A cheaper match for the same visual shade usually means a different pigment set, which can mean worse lightfastness or lower heat stability. This is the most common hidden difference between two quotes for “the same” colour. See organic vs inorganic pigments for plastics.

What to ask: what is the lightfastness and heat stability of this match, and does it hold at my processing temperature?

Matched colour or mono concentrates?

Not every processor should buy matched colour.

Matched colour masterbatch suits you if you run a limited number of shades, want the supplier to carry the matching responsibility, and would rather not hold colour expertise in-house.

Mono concentrates — single pigments at high loading, blended at the machine — suit you if you run frequent short colour changes, have a spectrophotometer and trained staff, and want to adjust shade without waiting for a reformulation.

A supplier who tells you mono concentrates are the better answer for your operation is giving you the more useful advice, even though it is usually the smaller order.

Where colour complaints actually come from

When a part is off shade, the masterbatch is the first suspect and frequently not the cause. In rough order of frequency:

1. Base resin changed — different grade, different lot, different supplier
2. Regrind percentage moved — regrind carries thermal history and its own colour
3. Process temperature drifted — some pigments shift with heat history
4. Part thickness or texture changed — both change measured and perceived colour
5. Measurement conditions differed between the two parties
6. The masterbatch

We cover the diagnostic sequence in why colour drifts between masterbatch batches.

What to ask a colour masterbatch supplier

1. Do you retain a physical master standard, and how is it stored?
2. What formula, illuminant and geometry do you measure under?
3. Will you match in my resin?
4. Under which illuminants has this match been checked?
5. What is the lightfastness and heat stability of this pigment set?
6. What is your batch release process, and what happens when one falls out of tolerance?

Talk to us

We manufacture colour masterbatch and mono concentrates on our own lines at Vasai under ISO 9001:2015. We retain a physical master standard for every matched colour and measure against it, and we will match in your resin rather than ours.

We will also tell you when mono concentrates are the better fit for how you actually run.

Send us your colour standard, your polymer and grade, your part thickness and the illuminants the part will be seen under, and we will tell you what tolerance is realistic before anything goes on a purchase order. Related: colour masterbatches, mono concentrates, special effect masterbatches, household, furniture, cosmetics.

Frequently asked questions

What is colour masterbatch?

Pigment dispersed at high concentration in a carrier polymer, added to natural resin at the machine to colour the finished part. A matched colour masterbatch is formulated to reproduce a specific shade, with the supplier carrying responsibility for the match.

What is a retained master standard and why does it matter?

A physical plaque of the approved colour, kept by the supplier under controlled conditions, that every future batch is measured against. It matters because the alternative – matching against your original sample – drifts as that sample yellows, scratches and ages.

Should the supplier match colour in my resin or theirs?

In yours. Base resin grade, MFI, filler content and regrind all move measured colour, so a match made in a house resin and shipped into yours introduces a variable between the approved plaque and your first production run.

What is metamerism in plastics colour matching?

When two samples match under one light source and visibly differ under another, because they use different pigments with different spectral reflectance curves. It is why a lab approval under daylight can fail under retail LED or shop-floor fluorescent lighting.

Why is one colour masterbatch quote cheaper than another for the same shade?

Usually a different pigment set. The same visual shade can be built from cheaper pigments with lower lightfastness or heat stability, which costs nothing today and shows up as fading or a colour shift at temperature later.

Should I buy matched colour masterbatch or mono concentrates?

Matched masterbatch if you run few colours and want the supplier to own the match. Mono concentrates if you run frequent short colour changes, have a spectrophotometer and trained staff, and want to adjust shade in-house without waiting for a reformulation.

My part is off shade. Is it the masterbatch?

Often not. Check base resin grade and lot, regrind percentage, process temperature, part thickness and surface texture, and whether both parties measured under the same conditions. Each of these moves colour and each is a more frequent cause than the colourant.

What Delta E tolerance should I specify?

It depends on how the part is viewed. Under 1.0 where parts sit against each other, 1.0 to 2.0 for most industrial parts, and wider where parts are never seen together. State the formula, illuminant and geometry alongside the number or the tolerance is not enforceable.