How to inspect pens and markers before shipment

Agree the test brief before production

Specify the pen or marker type, ink, tip, intended writing surface, pack contents and approved physical reference. Agree test conditions and pass criteria before production, including acceptable starting behaviour and colour variation. Use the general inspection guide for sampling and acceptance decisions; this guide covers the writing-product checks to put into that brief.

Have the inspector draw samples from different finished cartons, packs, colours and identifiable production batches. Record where each sample came from. Keep samples for immediate writing separate from unopened samples reserved for storage testing, so prior use does not change the storage result.

Check writing from the first stroke

Use the agreed paper, board or other intended surface. Record the first stroke before any scribbling, shaking or priming, unless the product instructions require preparation. Follow with continuous lines, curves and repeated start-stop writing using a consistent angle and pressure. Look for skips, fading, blobs, scratchiness and uneven line width.

For dry-wipe markers, include removal from the agreed board after the agreed drying interval. For other markers, check the intended application rather than assuming every surface behaves alike. Keep labelled writing sheets and video of intermittent faults. A pen made to work by repeated scribbling should not silently pass a test intended to assess immediate starting.

Check cap fit and ink leakage

Remove and refit caps using the agreed handling method. Check that they seat fully, stay attached during normal handling and can be removed without damaging the barrel or tip. Look for cracks, distorted closures and contact between the cap and writing tip. A click alone does not establish an effective seal.

Check unopened packs for stains, then inspect the cap interior, tip housing, barrel joints and packaging. Test capped samples in the agreed storage orientations with clean absorbent material beneath them. Record conditions and any leakage. Avoid improvised heating or pressure tests; arrange specialist work where the brief calls for it.

Retest after the agreed storage

Agree storage duration, temperature, humidity, orientation and packaging before reserving production samples. Record when storage begins and ends, and keep caps fitted as specified. After storage, repeat the first-stroke and continuity checks against an unstored control from the same batch. Record dried tips, delayed starting, changed colour and leakage.

If cap-off recovery matters, make it a separate test with an agreed exposure and recovery method. Do not confuse it with capped storage. A shipment-day writing check cannot prove future shelf life, and accelerated ageing needs a justified method and interpretation. See managing shelf life for planning stock around storage evidence.

Match colours and close the report

Make swatches from matching colours across different packs and cartons, using the same surface, stroke method, drying interval and lighting. Compare them with the approved physical swatches. Check written ink colour separately from cap colour, barrel decoration and printed pack labels. Record missing, duplicated or wrongly labelled colours; screen photographs alone are poor acceptance references.

Attach sample identities, swatches, test conditions, results and unresolved checks to the report. Do not mark storage testing as passed before it finishes. After corrective work, repeat the affected checks on the corrected batch. The reference-sample guide helps preserve comparison material for later deliveries.

UK businesses selling consumer products must not sell products they know, or should have known, are unsafe. These performance checks do not establish product safety. Brief a suitable laboratory separately on ink and cap safety for the intended users; use the laboratory testing guide to distinguish that work from factory inspection.