Cleaning acrylic surfaces is one of the current challenges in contemporary art conservation-restoration. Although acrylic paint is often associated with being a resistant and versatile material, its behavior when exposed to water, solvents, or mechanical action can be complex. For this reason, any cleaning proposal requires a particularly controlled methodology.
As part of my Final Degree Project in Conservation-Restoration, I developed an experimental trial focused on the study of enzymatic systems for cleaning acrylic surfaces with lipid deposits. Specifically, the research was based on the application of a Candida rugosa lipase, an enzyme capable of acting on bonds present in fatty materials, waxes, and oils.
The main objective of the trial was not to propose a definitive solution, but to assess the potential of this type of treatment as a controlled alternative for the removal or reduction of wax deposits on acrylic paint. For this purpose, pictorial samples made with acrylic paint were prepared and bee wax stains, used as a model of lipid deposit, were applied to them.
What is enzymatic cleaning in conservation-restoration?
Enzymatic cleaning uses enzymes—molecules of biological origin—to act selectively on a specific type of material. Unlike a solvent, which tends to act more broadly, a well-selected enzyme targets a specific substance, making it an interesting working approach for sensitive surfaces. It is not a universal method, but rather another tool within the conservator-restorer's judgment.
Why a lipase?
Lipases are enzymes that catalyze the hydrolysis of certain ester bonds present in lipid substances. This capability makes them an interesting tool for treatments aimed at acting on fatty materials without directly resorting to more aggressive methods.
In conservation-restoration, the interest of enzymes lies precisely in their specificity. Unlike a solvent, which can affect different components of a surface, an enzyme can be selected based on the material to be treated. In this case, Candida rugosa lipase was chosen for its relationship with the degradation of lipid materials and its potential application in controlled aqueous systems.
The role of gelled systems
One of the key aspects of the trial was the application of the enzyme using gelled systems. This decision addressed a fundamental need: to control contact between the treatment and the acrylic surface.
Gels allow for the retention of the aqueous medium and localize the product's action to a specific area. This is especially important for acrylic paint, where direct liquid application could lead to excessive moisture dispersion or uncontrolled interaction with the paint film.
During the trial, different gelled systems and application times were used to observe how the response of the wax stains and the pictorial surface varied. After each application, gel residues were removed, and the final state of the samples was documented.
Observation, comparison, and documentation
The evaluation of the results was carried out through direct observation, photographic documentation, and comparative analysis of the images obtained before and after the treatment. This process allowed for the recording of visible changes on the surface, such as the possible reduction of the stain, the softening of the deposit, or the presence of detached particles during cleaning.
In this type of research, documentation is as important as the treatment itself. It is not enough to state that a stain "has decreased" or that a surface "looks cleaner"; it is necessary to record the changes in an organized and comparable manner. Therefore, the use of images taken under controlled conditions allowed for the study of the evolution of the samples and supported the interpretation of the results.
Results and limitations of the trial
The obtained results showed that enzymatic systems applied using gels can promote certain changes in wax deposits, especially in relation to their softening, fragmentation, or partial removal. However, they also highlighted the need for further investigation into optimal application conditions.
Factors such as the type of gel, application time, enzyme concentration, moisture input, or removal method can significantly influence the final outcome. Therefore, the treatment should not be understood as a recipe applicable automatically, but as a methodology that requires prior testing, control, and adaptation to each specific case.
The trial confirmed a fundamental idea: in conservation-restoration, the effectiveness of a treatment cannot be assessed solely by its ability to remove a deposit. Its degree of control, compatibility with the original surface, and potential risks associated with its application must also be considered.
A line of research for contemporary art
The application of enzymes in the cleaning of acrylic paint represents a promising line of work within the conservation of modern materials. Its interest lies not only in the possibility of acting on specific deposits, but also in the search for more selective, localized, and respectful treatments for the artwork.
This experimental trial has allowed for the exploration of the behavior of a Candida rugosa lipase against wax deposits on acrylic paint and opened new questions for future research. Among these, it would be interesting to delve deeper into the optimization of application times, conductivity control, and the comparative study between different gelled systems.
Ultimately, the research proposes a biotechnological approach to a very specific problem in conservation-restoration: how to intervene sensitive acrylic surfaces without necessarily resorting to more invasive cleaning systems. A small question, but with significant implications for the future of contemporary art conservation.
Frequently Asked Questions
What is a lipase and what materials does it act upon?
A lipase is an enzyme that catalyzes the hydrolysis of ester bonds present in lipid substances: fats, oils, and the ester fraction of some waxes. That is why it is studied for treating fatty deposits.
Why are enzymes applied with gels?
The gel retains the aqueous medium and localizes the action to a specific area, limiting penetration and moisture dispersion. On sensitive surfaces like acrylic, this control is essential.
Does enzymatic cleaning replace solvents?
No. It is a complementary, more selective approach that does not eliminate the need for professional judgment, prior testing, or other cleaning methods depending on each case.
Do you work with sensitive surfaces? At Innovart, you can find Candida rugosa lipase and Laponite RD thickener for cleaning gels. View solvents and cleaning agents →
Do you have questions? Write to us via WhatsApp or at info@innovart.art · innovart.art
Where to buy enzymatic cleaning materials in Spain
At Innovart, we work with curated conservation and restoration materials and provide real technical advice: if you have a specific intervention and don't know which product fits, you can ask us before purchasing.
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