What the surface tells you first

The easiest test is also the least glamorous. Hold the sheet under a strong light and look at how the ink sits on the paper. A Pierre Alechinsky print vs original question often resolves here, because a hand-printed or lithographic impression carries texture that a flat reproduction cannot fake for long. Look for a slight ridge where the plate or stone pressed into the sheet. That plate mark is not guaranteed on every genuine impression, but when it is present it is a useful clue. A reproduction usually shows no pressure, no plate edge, and no variation in ink density across the surface.

Alechinsky worked across etching, lithography, and screenprint, and each process leaves a different trace. An etching can show a soft burr or a little plate tone in the shadows. A lithograph may show a slightly granular ink that sits on the surface rather than soaking in. A later offset reproduction tends to look too even, with dots visible under magnification and no real tooth in the paper. If you can see a regular rosette pattern under a loupe, you are probably looking at a photomechanical copy rather than an original print.

Signature, numbering, and the paper trail

The signature is where buyers get tripped up, because a printed facsimile can look convincing from a distance. An original Alechinsky print is often hand-signed, usually in pencil or ink, and often below the image or on the margin. The signature should sit slightly off the image area on many sheets, and it should show the pressure and variation of a hand. A reproduction may carry a printed signature that looks too uniform, or none at all. Neither fact alone settles the Pierre Alechinsky print vs original question, but together with the surface they narrow the field quickly.

Ask for the edition number, the printer, and the publisher or workshop mark. Original prints are usually issued in a limited edition and numbered in pencil, such as 14/75, with the artist's signature alongside. The printer's mark or the publisher's chop can be a useful check if you know the edition. A reproduction sold as a poster or a giclée may have no edition number at all, or a printed one that means nothing in the print market. When the paperwork is thin, treat the object as a reproduction unless you can verify it another way.

When the line between print and reproduction blurs

The honest trouble is that the word print covers more than one thing. An original print is made from a plate, stone, screen, or block, and the artist or a workshop pulls it in an edition. A reproduction is made later from a photograph or scan of the original, often as a poster, a giclée, or a commercial offset. Both can be signed, and both can be sold honestly, but they are not the same market and they are not the same price. The Pierre Alechinsky print vs original distinction matters most when money is involved, because a reproduction can be a perfectly good object without being a collectible print.

If you want certainty, compare the sheet against a known impression from the same edition, or ask a specialist who handles prints from the period. A reputable dealer should be able to tell you the process, the edition size, and whether the sheet is an original impression or a later reproduction. When that information is missing, the safest reading is to assume a reproduction until proven otherwise. That is the real risk buyers face: a convincing facsimile sold with the language of an original edition.