Blotter paper is simply paper made without the water-resistant chemicals that normal paper contains. That single difference is what gives it the ability to rapidly absorb liquids. Making it at home requires basic papermaking equipment and an understanding of why leaving out certain additives matters.
Why Blotter Paper Absorbs So Well
Standard paper goes through a process called sizing during manufacturing. Sizing deposits water-repellent materials onto the paper fibers, which increases surface tension and prevents liquids from soaking in. This is why printer paper holds ink on its surface instead of letting it bleed through.
Blotter paper skips this step entirely. Paper made without any sizing agent is known as “waterleaf” paper, and it is extremely absorbent. Without the hydrophobic coating that sizing creates, the tiny channels between cellulose fibers act like capillaries, pulling liquid inward quickly and evenly. So the core principle of making blotter paper is straightforward: make paper, but leave out anything that would resist moisture.
Equipment You Need
Home papermaking requires surprisingly few tools. The essential piece is a mold and deckle, which is a two-part wooden frame with a fine mesh screen stretched across one side. The mold (the screen) catches the pulp, and the deckle (the open frame) sits on top to contain it and define the sheet’s edges. These come in standard sizes from A7 (roughly 4.5 by 5.7 inches) up to A4 (about 9.8 by 13 inches). Starter kits with a mold, deckle, absorbent felts, and a sponge typically cost under $20.
Beyond that, you’ll need:
- A blender or hand mixer to break down fiber into pulp
- A large shallow tub (a plastic storage bin works well) to hold the pulp slurry
- Absorbent felts or cotton cloths for pressing water out of the formed sheets
- A rolling pin or flat press to squeeze out excess moisture
- A flat drying surface like a clean board, glass pane, or stretched fabric
Choosing the Right Fiber
The fiber you start with determines the quality of your blotter paper. Cotton is the gold standard. Laboratory-grade blotting papers are made from pure cotton linters with an alpha-cellulose content above 98%, which makes them chemically inert and free of contaminants. You don’t need lab-grade purity at home, but cotton should still be your first choice.
Cotton linter sheets (sold at art supply stores as “cotton rag” or “cotton linter for papermaking”) give you the cleanest, most absorbent result. You can also use plain cotton fabric scraps, cotton balls, or even high-quality cotton paper like unprinted stationery. Avoid anything with synthetic blends, dyes, or coatings.
Recycled paper can work in a pinch, but it already contains sizing agents from its original manufacturing. Blotter paper made from recycled office paper will be noticeably less absorbent than one made from raw cotton. If you do use recycled paper, stick with uncoated, unglossed types and soak them longer to help break down residual sizing.
Step-by-Step Process
Preparing the Pulp
Tear your cotton fiber or paper source into small pieces, roughly one-inch squares. Soak them in warm water for at least a few hours; overnight is better. Cotton linters may need a full 24 hours to soften completely. Once soaked, blend the material with plenty of water until you get a smooth, porridge-like consistency with no visible chunks. The ratio doesn’t need to be precise, but aim for roughly one part fiber to ten parts water in the blender.
The critical step for blotter paper happens here: do not add any sizing agents. Many papermaking tutorials call for adding liquid starch, gelatin, or methylcellulose to strengthen the paper and reduce absorbency. Skip all of these. You want waterleaf paper, which means the pulp should contain nothing but fiber and water.
Forming the Sheet
Fill your tub with several inches of water and stir in the blended pulp. The slurry should be thin enough that you can see your hand through it when submerged. Too much pulp per sheet makes overly thick, uneven paper. Too little makes fragile sheets that tear when handled.
For blotter paper, you want sheets thicker than standard writing paper. Blotter paper typically falls in the range of 170 grams per square meter (GSM) or higher, compared to about 80 GSM for copy paper. You control thickness by how much pulp is in the vat and how slowly you lift the mold. Experiment with a few test sheets to find the density you want.
Hold the mold with the deckle placed on top, dip it into the slurry at an angle, then level it out while submerged. Lift it straight up and let the water drain through the screen. Gently shake the mold side to side while it drains to help the fibers interlock evenly. Once the water stops dripping, you have a formed sheet sitting on the mesh.
Pressing and Drying
Place a damp felt or cotton cloth on a flat surface. Flip the mold onto the felt in one smooth motion and press gently with a sponge on the back of the screen to transfer the wet sheet. Peel the mold away carefully. Layer another felt on top and use a rolling pin to press out as much water as possible. Firm, even pressure matters here. Uneven pressing creates thin spots that tear easily.
Drying is where blotter paper diverges from other handmade papers. Air drying flat on a board or screen gives you the softest, most absorbent result. Avoid using heat or pressing the paper between heavy weights for extended periods, as excessive compression reduces the open structure between fibers that makes blotter paper work. You want those tiny air channels intact. Drying time depends on thickness and humidity, but expect 12 to 48 hours for a thick blotter sheet.
Adjusting Thickness and Absorbency
If your first batch isn’t absorbent enough, the most likely culprit is residual sizing from recycled source material. Switch to raw cotton fiber, or try a longer soak with more blending to further break down the fibers.
If sheets are too thin and fragile, add more pulp to the vat or dip the mold more slowly. You can also form two thin sheets and couch them together (layer one wet sheet directly onto another) before pressing. This bonds them into a single thicker sheet while the fibers are still wet.
For very uniform thickness, which matters if you’re making fragrance testing strips or craft blotter sheets, try pulling the mold through the slurry at a consistent speed and letting it drain on a level surface. Any tilt during draining sends pulp to one end.
Uses That Require Higher Purity
If you need blotter paper for fragrance testing, the paper should be chemically inert so it doesn’t interfere with the scent. This means using pure cotton fiber, avoiding any additives, and making sure your equipment is clean and free of soap residue. Commercial fragrance blotter strips are made in additive-free environments specifically so the paper contributes no smell of its own.
For science projects like simple chromatography, homemade cotton blotter paper works reasonably well. Commercial chromatography paper is made from cotton linters with over 98% pure cellulose, which ensures consistent wicking rates and minimal chemical interference. Homemade versions won’t match that precision, but they’ll demonstrate the same principles.
For art applications like ink blotting, calligraphy practice, or printmaking, homemade blotter paper is more than adequate. The slight texture variations from hand forming actually add character that many artists prefer over machine-made alternatives.