Supplier sent the wrong material, size or colour: how to prove it
A wrong-specification claim is strongest when the final approved requirement can be identified and the difference can be measured or independently verified.
Updated 24 July 2026
Quick answer
Put the promise and the observed result side by side: final specification, approval date, test or measurement, affected quantity and requested remedy.
Identify the final approved version
Save the final purchase order, drawings, colour code, material description, sample approval and any later revision.
Resolve contradictions between an early chat message and the final signed or platform specification.
Measure the mismatch
Use calibrated tools, colour references, labels, laboratory or expert testing where the issue cannot be established visually.
Record the method, date, sample identity and chain of custody for any external test.
Show commercial relevance
Explain why the difference affects use, compliance, resale, safety, compatibility or the agreed customer order.
Avoid claiming that a difference is material if it has no documented effect on the transaction.
Choose a proportional remedy
State whether the mismatch justifies replacement, rework, price reduction, partial refund, rejection or cancellation under the applicable terms.
Calculate the amount from the affected quantity and supported costs rather than a round estimate.
Common mistakes
- Relying on screen colour to prove a colour-code mismatch
- Calling a material fake without testing or reliable documentation
- Ignoring a later approved specification change
- Failing to identify how many units are affected
Frequently asked questions
Are photographs enough to prove the wrong material?
Sometimes not. Material composition often requires labels, supplier admissions, technical documents or independent testing.
What if the sample and purchase order conflict?
Preserve both and identify which document was accepted as final. The sequence of approvals is important.
Should I test every unit?
Not always, but the sample must be representative and the method should be recorded.
Describe the situation and identify the documents you already have. Do not put confidential documents in the public chat.
Open the application formThis guide explains evidence organization and practical next steps. It does not predict an outcome or replace legal advice.
Educational information, not legal advice. Check current platform rules and deadlines.