Matsui RC 301 Spot Black | Ready-to-Use High-Mesh Water-Based Black Ink for Ultra-Soft Spot Color Screen Printing on Cotton
Matsui
Matsui RC 301 Spot Black (WB0312) is a premium ready-to-use water-based black ink that delivers deep, rich, saturated black with an ultra-soft hand feel — straight from the container with zero mixing required. Part of the Matsui RC 301 Ready-For-Use series. Prints through mesh up to 305/inch for the softest, most fabric-integrated black print achievable in textile screen printing. Open the container, pour, and print. Compatible with Matsui additives for open time and wash fastness. Works on cotton and cotton/poly blends. PVC-free, OEKO-TEX Standard 100 compliant.
Price range: $29.99 through $3,284.99
Description
Deep Black. Zero Mixing. Open and Print.
Matsui RC 301 Spot Black is for shops that want a deep, rich, production-ready black without pigment formulas, weighing, or mixing. Open the container and print. At 305 mesh the ink penetrates into cotton fibers for a soft, breathable feel that high-end retail customers notice immediately.
Spot Black is a finished spot color, not a clear base requiring Neo Pigments and Color Mixer Software. No mixing, no weighing, no formula lookup — open and print. The fastest path to a professional black on cotton.
Strong color density for premium spot color printing. Spot Black delivers the deep black that fashion and retail brands expect — not a washed-out WB grey.
Prints through mesh up to 305/inch for the thinnest possible ink deposit and the softest hand feel. At fine mesh the ink penetrates into cotton fibers rather than sitting on the surface.
Handles small text, thin lines, and detailed logos well. The consistent factory-premixed viscosity produces repeatable fine-detail prints batch after batch.
Add Retarder MG (1-5%) for screen open time on long runs. Add Fixer WF-N (1-5%) for better wash durability. Or use Quick Additive (6-9%) for all four benefits in one step.
Factory-premixed for repeatable production results. Every container matches the last — consistent black shade, consistent viscosity, consistent performance.
Best Use Cases
The core use case. Deep black spot color on light cotton tees without any ink prep time. Open, pour, print.
Small text, thin lines, and precise black linework on cotton that requires consistent, fine-detail-capable black ink.
The black hit in multi-color designs on cotton. Often the most-used screen on a production run — Spot Black keeps it simple and consistent.
Works well for halftone and detailed artwork on cotton. Adjust with Thickener B if you need more dot control for fine halftones.
Spot Black vs Mixed Black — Which to Choose
| Feature | Spot Black ★ This | Neo Pigment Black in Base |
|---|---|---|
| Prep Time | ★ Zero — open and print | Requires weighing + CMS formula |
| Substrate | Cotton, cotton/poly | Any base supports any substrate |
| Black Shade | Fixed — rich saturated black | Customizable shade via pigment mix |
| Stretch Fabrics | Not recommended | Yes — choose the right base |
| Halftone Capable | Yes | Yes |
| Cost | Single SKU — efficient | Multiple products needed |
| When to Use | Daily cotton black production | Custom shade, stretch, or specialty |
For stretch or performance fabrics, mix black Neo Pigment into Stretch Clear or EasyPrint Clear instead.
Compatible Matsui Additives
All additives below are compatible. Do not exceed 15% total additives by weight. PVC-free, OEKO-TEX Standard 100 certified.
| Additive | Dose | What It Does |
|---|---|---|
| Quick Additive | 6-9% | All-in-one: open time + hand feel + wash fastness + dot retention |
| Retarder MG | 1-5% | Extends screen open time — prevents ink drying in mesh |
| Fixer WF-N | 1-5% | Wash & crock fastness crosslinker — no pot life — meets all RSLs |
| Softener MG | 1-4% | Soft hand feel — improved fabric penetration and elasticity |
| Thickener B | 0.25-1% | Raises viscosity — halftone dot retention |
| RV Additive | 1-3% | Reduces viscosity — better than water for thinning |
Pro Tips & Critical Notes
Water-based inks require proper curing and crosslinking for wash durability. Add Fixer WF-N at 1-5% and ensure the print reaches 320F throughout during curing.
Spot Black is optimized for cotton and cotton/poly blends. For black on stretch performance fabrics, mix black Neo Pigment into Stretch Clear or EasyPrint Clear for the elasticity needed without cracking.
For high-poly garments where dye migration is a concern, print a dye migration blocker first and test before production.
Technical Specifications
Matsui RC 301 Spot Black (WB0312) — Technical Specifications
| Specification | Value / Detail |
|---|---|
| SKU | WB0312 |
| Product Type | Ready-to-use water-based black ink |
| Color | Deep saturated black — no mixing required |
| Max Mesh | 305/inch (120/cm) |
| Cure Temperature | 320F (160C) |
| Viscosity Modifications | Not required for normal conditions |
| Fabric Compatibility | Cotton and cotton/poly blends |
| Retarder MG | Retarder MG 1-5% for screen open time |
| Fixer WF-N | Fixer WF-N 1-5% for wash fastness |
| Quick Additive | Quick Additive 6-9% all-in-one solution |
| Halftone | Yes — adjust with Thickener B for dot control |
| Compliance | OEKO-TEX Standard 100, CPSIA, HR4040, PVC-free |
| Dry Clean / Iron Safe | Yes |
Technical Sheets / Safety Data Sheets / Documents
FREQUENTLY ASKED QUESTIONS
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What is Matsui RC 301 Spot Black?
Matsui RC 301 Spot Black (WB0312) is a premium ready-to-use water-based black ink for screen printing on cotton and cotton/poly blends. It is factory-premixed for consistent, deep saturated black — open the container and print with no mixing, weighing, or formula lookup required.
When should I use Spot Black instead of mixing black with Neo Pigments?
Use Spot Black when you want the fastest, simplest approach to a rich cotton black — daily production, standard jobs, and multi-color designs where black is one hit among many. Mix black Neo Pigment into a base when you need a custom shade, are printing on stretch/performance fabrics, or need to match a specific Pantone black.
Does Spot Black work on polyester or stretch fabrics?
Spot Black is optimized for cotton and cotton/poly blends. For stretch or performance fabrics, use black Neo Pigment mixed into Stretch Clear or EasyPrint Clear for the elasticity needed. For dark polyester where dye migration is a concern, test with a blocker before production.
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