Matsui Hydrochromic White — Now You See It, Now You Don’t

Imagine a white logo on a dark workout shirt. The wearer hits the gym, starts sweating, and the logo disappears — replaced by a hidden message or graphic that was printed underneath. As the shirt dries, the white logo reappears and conceals the hidden design again.

That is Hydrochromic White.

It is a water-reactive ink that changes state based on moisture. When the garment is dry, Hydrochromic White is a visible, opaque white. When moisture hits the garment — sweat, water, rain, or humidity — the white becomes transparent and effectively disappears. The effect is reversible and repeats indefinitely. Wet: invisible. Dry: visible. Wet: invisible. Dry: visible.

This is not a gimmick that wears off. The moisture-reactive property is built into the ink’s chemistry. It works the first time the garment gets wet, and it works the hundredth time. The disappearing and reappearing cycle continues for the life of the garment.

The applications are immediately obvious: gym apparel where sweat reveals hidden designs, performance activewear with moisture-activated branding, novelty tees with hidden messages, promotional merchandise with interactive surprises, concert and event apparel where rain or water reveals hidden artwork, and any application where the interaction between the garment and moisture creates a memorable, shareable, social-media-worthy experience.

Three Creative Modes — Standalone, Concealer, Color Shift

Hydrochromic White offers three distinct creative approaches.

Mode 1 — Standalone Disappearing White

Print Hydrochromic White as a standalone white design on a colored garment. When dry, the white design is visible. When wet, the white disappears and the garment color shows through. Simple, dramatic, and effective. A white logo on a black tee that vanishes during a rainstorm.

Mode 2 — Conceal-and-Reveal Over a Printed Design

This is the most compelling creative mode. Print a colored design first using standard Matsui inks such as 301C Clear plus Neo Pigments, Spot Black, or any Matsui color. Flash the colored design, then print Hydrochromic White over the design as the top layer. When dry, the Hydrochromic White conceals the colored design underneath. When the garment gets wet, the Hydrochromic White disappears and reveals the hidden design beneath. A hidden message. A secret graphic. A brand reveal. The creative possibilities are enormous.

Mode 3 — Disappearing Pastel / Color-Shift Effect

Tint Hydrochromic White with Matsui Neo Pigments to create pastel colors. When dry, the tinted Hydrochromic White appears as a pastel color because the white carrier lightens the pigment. When wet, the Hydrochromic White carrier disappears, but the Neo Pigment color remains visible. The effect is that the pastel color shifts to a more saturated, deeper version of itself when wet. A pastel pink becomes a more vivid pink. A pastel blue becomes a deeper blue. The white component vanishes while the color stays.

Hydrochromic White vs. Phantom Clear — Two Opposite Effects

Matsui makes two moisture-reactive special-effect inks. They produce opposite effects. Customers frequently confuse them, so this chart makes the difference clear.

The simple decision: If you want something to disappear, use Hydrochromic White. If you want something to appear, use Phantom Clear. Stock both for maximum creative flexibility, since many designs can use both products together.

How Matsui Additives Improve Your Production with Hydrochromic White

Hydrochromic White is production-ready from the container. Matsui additives can optimize the production process.

The problem: Ink dries in the screen during production pauses. The additive solution: Retarder MG at 1–5% extends open time.

The problem: Prints fade or the hydrochromic effect diminishes after repeated washing. The additive solution: Fixer WF-N at 1–5% crosslinks the binder for improved wash fastness and durability of the hydrochromic effect.

The problem: Ink sits on top of fibers instead of bonding in. The additive solution: Softener MG at 1–4% enhances penetration for better adhesion and softer hand feel.

Additional additives include Thickener B at 0.25–1% to increase viscosity, and RV Additive at 1–3% to reduce viscosity.

Browse the complete Matsui additive collection here.

Why Screen Printers Choose Hydrochromic White

I print gym and workout apparel and want an interactive sweat-reactive effect.

This is the core Hydrochromic White application. Print a design with Hydrochromic White on a colored workout shirt. When the wearer sweats, the white design disappears, revealing either the garment color or a hidden design underneath. The effect is interactive, memorable, and highly shareable on social media.

I want to hide a design under a white layer that reveals when wet.

The conceal-and-reveal technique is simple: print your colored design with standard Matsui inks, flash, then print Hydrochromic White over the top. Dry equals hidden. Wet equals revealed. Hidden messages, secret graphics, surprise brand reveals, and workout milestone markers all become possible.

I want pastel colors that shift to more saturated colors when wet.

Tint Hydrochromic White with Neo Pigments. The white carrier creates a pastel tone when dry. When wet, the white carrier vanishes, leaving only the more saturated Neo Pigment color. Pastel pink shifts to vivid pink. Pastel blue shifts to deeper blue.

I want novelty merchandise with a surprise element.

Concert tees, festival merchandise, event apparel, and promotional items all benefit from a surprise effect that adds perceived value and creates a talking point. The moisture-reactive cycle repeats indefinitely, so it remains a lasting feature rather than a one-time gimmick.

I need the effect to work on polyester and nylon, not just cotton.

Hydrochromic White works on cotton, polyester, nylon, and blended fabrics, giving it broader substrate compatibility than many moisture-reactive specialty inks.

I want to combine Hydrochromic White with Phantom Clear for a dual-effect design.

Print Phantom Clear for elements that appear when wet. Print Hydrochromic White for elements that disappear when wet. On the same garment, one design vanishes while another appears, creating a dramatic dual transformation effect.

Key Features

• Visible when dry, invisible when wet — moisture-reactive white ink that disappears when exposed to sweat, water, rain, or humidity and reappears when the fabric dries
• Conceal-and-reveal capability — print over a colored design to hide it when dry and reveal it when wet
• Tintable with Neo Pigments — mix with Matsui Neo Pigments to create pastel disappearing colors that shift to more saturated tones when wet
• Multi-substrate compatibility — works on cotton, polyester, nylon, and blended fabrics
• Ultra-soft hand feel — delivers softness that PVC inks cannot achieve
• Production-optimized with Matsui additives — compatible with the full Matsui additive lineup
• Zero viscosity modifications required — prints from the container
• PVC-free and eco-compliant — formulated in accordance with OEKO-TEX® Standard 100, CPSIA, and HR4040 requirements

Recommended Additives for Hydrochromic White Production

Browse the complete Matsui additive collection here.