The paper colour shows through the ink.
Process inks are generally transparent. On white paper, reflected light passes through the ink and returns from a bright base. On kraft, the returning light already carries the brown or grey cast of the sheet. Pale yellows, pinks and blues can become quieter or muddier, while darker colours may feel warmer and less separated from one another.
This is a physical interaction rather than a faulty RGB-to-CMYK conversion. The wider move from screen colour to print is covered in the RGB and CMYK preparation notes. Kraft adds another variable because the substrate itself is visibly coloured. A white screen preview cannot honestly reproduce every combination of ink, fibre, coating and lighting.
Design with the sheet instead of fighting it.
Strong dark line work, bold type, simple colour families and generous unprinted areas can make kraft feel intentional. Natural paper showing around an illustration can become part of the palette rather than an unwanted gap. Very subtle shadows, pale skin tones and low-contrast photographs may need more testing because distinctions visible on a bright display can compress on the finished stock.
Choose representative artwork early. A dense photograph, a pale tint, a brand colour, a black panel and the smallest reversed type reveal more than a page of unrelated swatches. Keep fine information readable without relying on colour alone. When codes, ingredients, captions or game text sit over a textured background, include the small type and fine-lines checks.
A white underbase changes the job rather than making kraft disappear.
Some print routes can place white ink beneath selected colours or use white as a visible printed element. That base can make overprinted colours brighter and can create white details that the paper alone cannot provide. It also adds separations, registration, ink coverage and proofing questions. It should be discussed as a production choice, not switched on as an effect at the end of design.
Build the mask according to the white-ink underbase artwork requirements. Availability, opacity, number of passes and suitable detail depend on the quoted process and material. A white layer may not look identical to white paper, and misregistration can show at the edge of small objects when the mask and colour artwork demand perfect alignment.
Paper shade and surface can move between samples.
“Kraft” describes a family of papers rather than one standard colour. Sheets can be warm, cool, light, dark, smooth, fibrous or visibly speckled. Recycled content and manufacturing variation may add character but can also influence colour consistency. Record the proposed stock reference and ask how representative a swatch or proof is of the supplied material.
Coatings and laminates can deepen the paper colour or change surface reflection. Creases, cut edges and wrapped corners may also show the substrate differently from a flat panel. For packaging, assess the closed and opened object under the lighting in which a customer is likely to see it. A single close-up photograph under studio light is not enough to approve the complete colour impression.
Agree what the proof is meant to answer.
A PDF can confirm layout, separations and the intended relationship between printed and unprinted areas. It cannot turn a white monitor into the chosen brown sheet. A stock swatch helps with material colour and texture but does not show the artwork. A printed test or representative sample may answer more, depending on how closely its stock, ink and production method match the proposed job.
List the colours and details that carry commercial meaning: a logo, product photograph, warning, barcode, illustrated skin tone or game symbol. Match those questions to a review route with the proof and colour options. Keep the approved artwork version and material description together so a later paper change does not pass as a colour-neutral substitution.