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Air-Ink

Air-Ink is a proprietary ink and composite-material brand made partly from captured carbon emissions.

Last updated August 26, 2026

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History

Air-Ink originated in research led by Anirudh Sharma, who later founded Graviky Labs. The initial idea emerged during work at the Massachusetts Institute of Technology on a printer capable of using carbon nanoparticles. The research treated carbon-rich combustion residue not simply as waste, but as a potentially recoverable pigment source. In 2013, the MIT Fluid Interfaces research group demonstrated a process for converting carbon residue into ink for an inkjet cartridge. This proof of concept helped establish the technical direction later associated with Air-Ink. Graviky Labs subsequently spent close to three years investigating how soot from vehicles and industrial equipment could be collected, purified, and formulated into usable materials. The challenge was not merely to gather black particulate matter, but to separate carbon from heavy metals, carcinogenic substances, and other contaminants associated with combustion emissions. The resulting system was branded Kaalink. It is described as a cylindrical capture device that can be retrofitted to exhaust pipes or diesel-generator exhaust systems. The device collects soot and other particulate emissions before the material is processed. Graviky Labs has reported capture rates of up to 93 percent of total exhaust particulate matter in relevant configurations, although such figures should be understood as technology claims rather than a universal performance level for every installation. The captured material undergoes further separation and purification to produce a carbon-based pigment that can be mixed with oils and other solutions. Air-Ink was presented as the principal creative application of this recovered pigment. Product descriptions have included pens, drawing inks, writing inks, printing inks, and composite materials. The brand's communications frequently connect a small finished object with a quantity of pollution: one pen has been described as containing carbon collected from roughly 30 to 50 minutes of vehicle emissions. Another public comparison stated that emissions from approximately 2,500 hours of driving by a standard diesel vehicle could yield about 150 litres of ink. These comparisons are intended to make the scale of pollution more comprehensible, but they do not mean that using Air-Ink alone eliminates the underlying emissions source. The brand received prominent public exposure in June 2016, when Air-Ink products were given to artists in Hong Kong for the creation of murals and street art in the Sheung Wan district. The project was associated with Heineken and used the city's air-quality challenges as part of the campaign's context. This activation helped move Air-Ink from a laboratory and engineering story into the fields of design, advertising, and environmental art. The technology was tested on multiple mobile and stationary sources, including cars, trucks, motorcycles, fishing boats, and diesel generators in Bangalore and Hong Kong. Graviky Labs also described a model in which third-party polluters could send collected particulate matter to its recycling facilities. The broader business proposition was to use recovered emissions as an input for materials while allowing printing and creative industries to associate their products with pollution reuse or carbon-offset narratives. The technology has also attracted practical questions. Critics have compared Kaalink with diesel particulate filters, which can increase exhaust back pressure and may marginally affect engine power, fuel economy, and carbon-dioxide emissions. These concerns illustrate the difference between capturing particulate pollution and reducing total environmental impact. Publicly available material does not establish Air-Ink's current production scale, commercial distribution, financial performance, or definitive operating status. Accordingly, its present market position remains uncertain.

  • 2016

    Hong Kong mural and street-art activation

    [1]

    Artists used Air-Ink products to create murals and street art in Hong Kong's Sheung Wan district in a project associated with Heineken.

  • 2013

    MIT carbon-to-ink demonstration

    [1]

    The MIT Fluid Interfaces research group demonstrated converting carbon residue into ink for an inkjet cartridge, providing an early technical basis for Air-Ink.

Products and positioning

Sustainable materials, pollution-derived pigment, environmental art, and circular reuse of combustion particulates

  • Writing instrument

    Air-Ink pen

    A pen product using Air-Ink's purified carbon-based pigment. Public descriptions use the pen to illustrate the material's pollution-reuse concept, stating that the carbon in one pen can correspond to roughly 30 to 50 minutes of vehicle pollution.

  • Artist ink

    Air-Ink drawing ink

    Drawing and artistic ink formulated from carbon captured from combustion emissions and processed to remove unwanted contaminants. It was used in public art and mural applications, including the 2016 Hong Kong activation.

  • Printing ink

    Air-Ink printing ink

    A printing-oriented application of the Air-Ink material platform. The brand presents recovered carbon as a pigment input for print uses and as a way for the print industry to connect material production with emissions reuse.

  • Composite material

    Air-Ink composite materials

    Composite products made using the same recovered carbon-material approach as the inks. Public descriptions identify composites as part of the proprietary Air-Ink product family, but do not provide a complete commercial range or detailed specifications.

  • Emission-capture technology

    Kaalink

    A cylindrical capture device associated with Air-Ink and Graviky Labs. It is designed for exhaust systems such as vehicle tailpipes and diesel generators, collecting soot and particulate emissions that can later be purified into carbon-based pigment.

Marketing campaigns

  • 2016Air-Ink Hong Kong street-art project

    Hong Kong

    In June 2016, Air-Ink products were provided to graphic artists in Hong Kong for murals and street art in the Sheung Wan district. The initiative linked the city's air-pollution context with the use of ink made from captured emissions and was conducted in association with Heineken.

    Outcome. The project gave Air-Ink significant public visibility as an environmental-art and sustainable-material concept, although its long-term commercial effect is not documented in the available source.

Brand decisions

  • Expansion from mobile exhaust to stationary emission sourcesStrategy

    Background

    Early descriptions focused on capturing soot from vehicle exhaust. Graviky Labs later tested the Kaalink approach on diesel generators and other stationary sources, reflecting an effort to broaden the available feedstock.

    Action taken

    The company developed applications for diesel-generator exhaust and accepted particulate material from third-party polluters for processing at recycling facilities.

    Aftermath

    The expansion increased the potential range of collection sources, but public sources do not establish the scale or continuing commercial status of the program.

Sources1 sources

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