OCEAN INK is fully biodegradable, non-toxic and microplastic-free seaweed-based ink that offers artists an alternative to conventional inks that can contain persistent synthetic chemicals and microplastics, which may enter waterways during use and clean-up. Founded by OCEANIUM, a materials innovation company unlocking the potential of seaweed. Working with sustainably sourced seaweed, the company uses proprietary water-based processing to transform seaweed into high-performance, materials and ingredients designed to replace resource-intensive and harmful alternatives.
Ocean Ink is the world’s first fully biodegradable, water-based ink derived from sustainably farmed seaweed, developed by Oceanium as a genuine alternative to harmful solvent and plastisol inks.
Designed for screen printing across textiles, packaging and promotional materials, it delivers high-quality, vibrant results with good oil and oxygen barrier properties — without the need for added binders.
Non-toxic and safe for humans and wildlife, OCEAN INK® offers full end-to-end traceability and supports brands working towards sustainability targets and more circular production models.
- Available in a natural seaweed gold, it brings a subtle, organic warmth to printed work while keeping environmental impact firmly in check.- Must be used within 2 months of opening.
- Once opened store in a cool dry place
- Must be used by November 2027
- Exclusive to Cass Art
Seaweed is one of the most sustainable raw materials on the planet:
- 100% renewable and carbon negative
- Grows in the ocean without freshwater, fertiliser, land, or pesticides
- Absorbs CO₂ and removes excess nitrogen and phosphorus from water
- Helps restore marine ecosystems and protect biodiversity
- Supports coastal livelihoods and regenerative ocean farming
- At OCEANIUM, seaweed is processed with low-waste, water-based green chemistry to create high-performance materials with a lighter footprint.
What can I use OCEAN INK® for?
OCEAN INK® is perfect for hand painting, mark making, experimental work, and screen printing on paper and card. It is not colour fast on clothing without curing.
How long does the INK take to dry?
Air dry in 24–48 hours. You can speed up drying at home using gentle heat, like a hairdryer or heat gun, keeping airflow moving to avoid overheating or wrinkling.
How long will my finished artwork last?
OCEAN INK® is water-soluble and biodegradable. To keep your artwork looking its best, avoid prolonged exposure to sunlight and consider sealing or protecting it.
Can I mix or thin OCEAN INK?
Yes. You can thin it with water (the colour will lighten slightly) and mix it with compatible natural or synthetic pigments.
How should I screen print with it?
It works with manual or automated screen-printing equipment. Recommended setup:
- Mesh: 34 threads or 77 threads/cm
- Ink deposit: ~30–50 g per m² per screen pass
- Stencil: Liquid emulsion stencil (e.g. Kiwo 2155)
- Squeegee: 9 mm thickness, 75 shore hardness, square edge profile
Is OCEAN INK safe to use?
Yes. It is water-based, non-toxic, and plant-based.
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