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C1S paper, short for “Coated One Side,” offers the unique advantage of combining a glossy, high-quality print surface with an uncoated reverse side that’s perfect for writing, labeling, or gluing. This balance makes it a preferred stock for packaging, postcards, covers, and other projects that demand both striking visuals and practical functionality.
C1S stands for “Coated One Side” — meaning the sheet has a glossy coating on one side and remains uncoated on the other. The coated face delivers a smooth, shiny finish for vibrant images and graphics, while the uncoated reverse stays slightly rough for writing or adhesive application:contentReference[oaicite:0]{index=0}:contentReference[oaicite:1]{index=1}. Because only one side is sealed, C1S stock resists dirt and moisture better than uncoated sheets:contentReference[oaicite:2]{index=2} while keeping the reverse side usable for handwriting or addressing:contentReference[oaicite:3]{index=3}.
The coated front side of C1S paper holds ink near the surface, producing rich color and crisp detail comparable to gloss stock. Because the coating prevents ink from soaking into the fibers, images appear vibrant and sharp:contentReference[oaicite:4]{index=4}. The uncoated back, however, absorbs ink more readily, resulting in softer colors and a matte finish. When designing, plan for this contrast: use the coated side for visuals and the uncoated side for text, notes, or adhesive-backed applications.
Yes. The uncoated side accepts handwriting with ballpoint or quick‑dry gel pens, making it perfect for postcards, address panels, and product labels. The coated side is best reserved for printing and finishing; inks and pen marks tend to sit on the surface and may smudge if not allowed to dry. For handwritten notes or signatures, use the uncoated reverse and allow a moment for the ink to absorb.
C1S sheets are produced in a range of weights. Lighter “text” weights (around 170 gsm or 60–70 #) are flexible enough for postcards and self-cover book covers, while mid-range weights (210–250 gsm) provide durability for paper bags, sleeves, and box inserts:contentReference[oaicite:5]{index=5}. Heavy weights (300–400 gsm) offer the rigidity required for folding cartons and luxury packaging:contentReference[oaicite:6]{index=6}. Selecting the appropriate weight ensures your printed piece balances strength, thickness, and cost.
Choose C1S stock when one side needs vibrant print and the other needs to remain writable or adhesive-friendly. Typical applications include postcards (printed image front, writable back):contentReference[oaicite:19]{index=19}, book and notebook covers:contentReference[oaicite:20]{index=20}, luxury folding cartons and custom paper bags:contentReference[oaicite:21]{index=21}, box inserts and product sleeves:contentReference[oaicite:22]{index=22}, greeting cards, board-book covers, and labels requiring a glossy face with a matte back for glue. It’s also a cost-effective substitute for C2S stock when only one printed side needs high-gloss impact.
