Chemicals & Additives

Chemicals and additives are the fine-tuning tools of the screen printing and offset printing trade. A reducer adjusts ink flow without killing the colour. A toner darkener turns a mediocre film positive into one that blocks UV properly. These products don't make the print. They make the print better. But they demand precision. Too much reducer and your ink becomes too thin to cure properly. Too much toner spray and your positive warps. We'll help you get the ratios right.

DTP Toner Darker

Solvent-based aerosol spray for making screen printing film positives from laser prints. When you print a screen positive from a desktop laser printer, the toner deposit is often too thin to fully block UV light during screen exposure. Fine for looking at, not dense enough for stencil-making. DTP Toner Darker's solvent partially dissolves the toner particles and re-fuses them into a denser, more opaque film that blocks UV far more effectively.

Where it's used

Enhancing desktop laser printer film positives for screen exposure. Most small and medium print shops in India produce their positives in-house with a laser printer. DTP Toner Darker bridges the quality gap between a budget laser output and a professional-grade positive. Affordable alternative to an imagesetter or high-density film output.

How to use it right

Let the freshly printed positive cool completely. Spraying hot toner can smear the image. Hold the can 20-25cm from the film surface. Apply a light, even mist. One thin coat, let it dry for 30 seconds, then assess. Apply a second coat if needed. Two light coats outperform one heavy coat every time. Use matte polyester laser film, not plain OHP transparency. Matte film accepts and holds the toner and spray far better. Work in a ventilated area because the solvent fumes are strong.

Watch out for

Heavy application is the most common mistake. Too much spray dissolves the toner too aggressively, causing it to spread and blur fine detail. It can also warp thin film stock. Always spray light and build up gradually. Don't spray on dye-based inkjet positives because this product is made for laser toner only. Don't use on photo paper or glossy film. The solvent attacks the coating. And always let the print cool first. Hot toner smears.

Storage & handling

12-18 months in a cool, dry place. It's an aerosol, so don't store above 50°C or in direct sunlight. Don't puncture or incinerate the can. Standard aerosol safety applies.

All Kinds of Reducers

Ink reducers for screen printing inks, these are viscosity-reducing additives matched to specific ink systems. A reducer lowers the ink's body and flow characteristics without diluting the pigment concentration as severely as a plain solvent or thinner would. A thinner is just raw solvent that cuts everything, pigment concentration, opacity, cure properties. A reducer is formulated to maintain the ink's balance while making it flow more easily through the mesh.

Where it's used

Adjusting ink consistency for different mesh counts, ambient temperatures, and print speeds. When plastisol feels too stiff on a hot day, or paper gloss ink isn't flowing smoothly through a high-count mesh, or textile paste is dragging on the squeegee. We stock reducers for every ink system we carry: PVC/plastisol reducer, textile reducer, paper ink reducer.

How to use it right

Critical rule: match the reducer to the ink system. PVC reducer for PVC/plastisol inks. Textile reducer for water-based textile inks. Paper reducer for paper and gloss inks. Never cross-contaminate because using the wrong reducer destabilises the ink chemistry. For curable (plastisol) reducer, add 5-15% by weight and mix thoroughly. For straight plasticiser reducer, maximum 3%. Any more and you'll soften the cured ink film and reduce wash durability. Always add to room-temperature ink. Adding reducer to hot ink gives misleading viscosity readings.

Watch out for

Over-reducing is a common and expensive mistake. Too much reducer in plastisol ink lowers the cure temperature threshold. Sounds good until you realise the cured film is soft, tacky, and doesn't survive washing. In textile inks, over-reducing dilutes the binder ratio, causing the same wash-off problems as under-binding. In paper inks, too much reducer extends drying time dramatically. Add conservatively. You can always add more, but you can't un-reduce an ink.

Storage & handling

12-18 months for most reducer types. Keep sealed because solvents evaporate even from loosely closed containers. Store away from heat sources and ignition points. Plasticiser-type reducers are stable at room temperature. Solvent-type reducers should be kept in a ventilated storage area per the safety data sheet.

Common Questions

What's the difference between a reducer and a thinner?

A thinner is pure solvent. It cuts the ink's viscosity by diluting everything: resin, pigment, additives. Your ink gets thinner but also weaker. Less opacity, longer cure time, reduced durability. A reducer is a formulated additive that lowers viscosity while maintaining the ink's balance. It typically contains some of the same resin system as the ink, so it reduces body without stripping out the functional chemistry. Think of it this way. Thinner waters down your coffee. Reducer makes it the right temperature without changing the recipe. For professional printing, always use a matched reducer, not a generic thinner.

How much reducer can I add before it affects print quality?

Depends on the type. Curable reducer (contains the same resin system as the ink), 5-15% is the safe working range. At 15%, you'll notice the ink running more freely through the mesh, which is usually the goal. Straight plasticiser reducer, maximum 3%. Plasticiser softens the ink film permanently, so even 5% starts compromising wash fastness and durability. If you find yourself needing more than 15% curable reducer, the ink is probably too old, too cold, or the wrong product for the job. Adding more reducer isn't the fix. Bring the ink to room temperature first, then add reducer incrementally until the flow feels right.

Is DTP Toner Darker for making my laser printer print darker?

Not for regular printing. DTP Toner Darker is a spray specifically for screen printers who make film positives using a desktop laser printer. The toner deposit from most laser printers isn't dense enough to block UV light during screen exposure. This spray fuses the toner particles into a denser layer so the positive blocks UV properly for stencil making. If you just want darker regular prints, you need to adjust your printer settings or replace the toner cartridge.

What kind of gum do you sell?

Gum arabic solution for offset lithographic printing. It's a natural resin dissolved in water that protects non-image areas on offset printing plates. Printers apply it to plates during storage and between print runs to prevent oxidation. This is a printing trade chemical, not adhesive gum or chewing gum.

Reducers and toner darkener are small purchases that prevent big problems. We stock matched reducers for every ink system we carry, PVC, textile, paper, so you always get the right chemistry. If you're troubleshooting an ink flow issue or trying to get better film positives from your laser printer, stop in and we'll help you sort it out.

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