Ink composition analysis: identifying resins, pigments and additives in a printing ink
Think in layers, not a single ingredient
An ink is a functional mixture of colorant, vehicle, binder and smaller additives. Pigments are dispersed particles, whereas dyes dissolve in a suitable phase; the distinction affects what a sample can reveal and how a print behaves. The binder fixes color to the substrate, while the vehicle controls application and drying. Defoamers, dispersants and other additives can change transfer or storage behavior even when the visible color looks the same. We ask whether the problem concerns the supplied ink, the dried print or a comparison between them.
A printer may see poor rub resistance, unstable viscosity or a color shift and assume a pigment change. Those symptoms are not chemically specific: binder composition, dispersion quality and application conditions can also contribute. A defensible analytical question is narrower, such as whether two inks show a different colorant family or whether a dried reference print contains a different binder pattern. Record the substrate and drying condition, since a printed film is a product of both formulation and process.
Wet ink versus printed film
Water-based ink can be reviewed in its supplied state, allowing the aqueous phase and dispersed solids to be considered together. A dried print answers a different question: it emphasizes retained pigment, binder and nonvolatile additives. If the original was solvent-based, the lost solvent cannot be inferred reliably from a dry film alone. Do not treat a dried impression as though it were a retained sample of the wet ink; specify whether you want to understand print chemistry or the incoming formulation.
We review water-based inks from overseas but do not receive liquid solvent-based inks. Other non-water-based liquid inks, such as UV-curable inks, are also not received as supplied; a cured print can be proposed. A cured or dried film or solids fraction may be proposed for review instead. The declaration should identify which form is being sent and include its SDS and product photographs. If a color comparison is central, tell us whether the two samples were printed on the same substrate under comparable conditions.
Interpreting an ink comparison
A result can identify supported components as compounds or broader chemical families and estimate their proportions. That does not turn a color match into proof of identical formulation: optical appearance is affected by pigment size, dispersion and print thickness as well as chemistry. Minor additives below detection limits may be missed. We prefer to state what differs in the submitted materials and what remains unresolved rather than infer a proprietary ink recipe from a single printed patch.
How to start
We accept overseas industrial samples after declaration review. Use the sample declaration form and read the related guide. Our reports are research-grade analytical reports from a laboratory that is not accredited. They cannot be used for product registration or legal proceedings.
FAQ
Can a printed film reveal its original solvent blend?
No. A dry printed film lacks solvent that evaporated during drying, so its original liquid blend cannot be reconstructed from that film alone.
Does equal color mean equal ink chemistry?
No. Similar color can result from different colorants or different dispersion and print conditions; compare chemistry and processing context separately.
Can we submit water-based ink from overseas?
Water-based ink is on our reviewable sample list, provided the full declaration and SDS are reviewed before shipment.
What should accompany two ink samples for comparison?
Describe each sample as wet ink or dry print, plus its substrate and drying history, so the comparison addresses like with like.
Send a sample declaration for this product and state the question you want answered.