My packaging looks black. Why does the printer say it uses several inks?

Define the promised production setup

Ask the printer whether the job is one specified spot ink or a particular process-black workflow. Those are different instructions. Record the required separation name and accepted file format. A logo copied from a rich-color document may look black while retaining multiple color channels or raster effects.

Adobe’s separation guidance describes inspecting color plates. Use the preview in appropriate production software and ask the receiving printer to confirm its interpretation. Do not assume that desaturating a screenshot produces a one-plate production file.

Inspect plate activity

A listed swatch alone is not enough; inspect which objects print on the active plates. Conversely, do not delete a production separation merely because its preview is unfamiliar. Confirm its role with the supplier.

For an InDesign document, Adobe’s current procedure opens Window → Output → Separations Preview, selects Separations, then uses the eye icons to inspect individual plates. This is an inspection step, not an instruction to convert every spot color to process. The source also notes that registration-colored objects print on all plates. A document preview cannot substitute for the receiving printer’s interpretation of the final export.

Compare the final exported file

For a fictional kraft sleeve intended for one dark ink, inspect the supplier-bound export and toggle the relevant plates. Check the small logo, pale shading and all placed graphics. Make a test proof through the intended workflow. Retain the original editable concept and a separately approved one-ink file so a later edit does not silently reintroduce full-color artwork.

Fictional diagnostic: the wordmark appears only on K, but a small placed picture also appears on C, M and Y. The wordmark’s construction does not establish a one-ink whole file. Record the picture and its version for correction or an approved single-ink replacement, then recheck the export. Conversely, listed CMYK plate names or unused swatches alone do not prove that every plate carries artwork. Record actual object activity and distinguish required production marks from unintended brand artwork.

If the job calls for one named spot ink, a K-only object is not automatically the correct deliverable. Ask the supplier to approve the required ink and mappings before converting or merging anything. Keep the original editable file and the revised supplier-bound export as separate versions, and verify that later image/effect changes did not add ink activity. For an unexpected all-plate wordmark, use the registration-swatch check. These observations are proposed examples; no InDesign inspection or press proof was run for this guide.

Approve ink count and legibility separately

A true single-ink file can still have unreadable small text or unsuitable fine lines on the chosen stock. Review the physical sample at actual size. CartVisual’s monochrome-looking packaging concept does not provide verified print separations. Record the printer-confirmed ink setup, file version and sample approval rather than labeling the image “one color” based only on its visible appearance.