Exploring Eco-Friendly Materials that Harden and Become Inert Upon Drying
Searching for natural alternatives to modern synthetic materials can lead to exciting discoveries. Two notable options include shellac and linseed oil. These traditional substances offer unique properties that make them suitable for various applications, from home decor to building materials.
Shellac: A Natural Resin with Enduring Properties
Shellac, also known as lac, is a naturally occurring resin derived from the secretions of the lac insect. This material has been used for centuries due to its versatility and durability.
Shellac is available in flake form and can be purchased at a cost of approximately $20 per half pound for a middling grade. To utilize shellac, it is dissolved in methylated spirits, a byproduct of whiskey and brandy production. This solution can then be applied in multiple coats to a variety of household objects. As the methylated spirits evaporate, the shellac dries to form a solid, long-lasting finish.
The resulting lacquerware can be further enhanced by adding pigments, transforming its natural yellowish hue into a vibrant, durable paint that can last for millennia. Lacquerware is a testament to the enduring properties of this natural resin.
Boiled Linseed Oil: A Versatile Autopolymerizing Resin
Boiled Linseed Oil is another eco-friendly option that offers a range of applications. This resin has the unique ability to react with oxygen, resulting in various properties, from a clear sealant to a hardening putty.
During the 1960s, linseed oil was widely used by workmen for a variety of tasks. It was mixed with ordinary household materials like chalk, cork, kerosene, and cotton to create caulk, seals, and finishes. Its versatility made it a valuable resource for waterproofing, wood finishing, and even stabilizing concrete and plasterwork.
However, just like shellac, linseed oil has certain limitations. It can soften in heat and absorb moisture, and it dissolves in alcohol. Additionally, it can craze with UV exposure, making it less suitable for outdoor use compared to modern materials. To address these limitations, various techniques have been developed over time to enhance its stability, such as the use of impact modifiers, hardeners, and plasticizers.
Stabilizing Eco-Friendly Resins
While both shellac and linseed oil have their drawbacks, they can be modified to improve their durability. These enhancements have been broadly applied to other resins like vinyl, urethane, and others, making them more resistant to environmental factors.
In the trade, these additives are known as “impact modifiers,” “hardeners,” and “plasticizers.” To our great-grandparents, these techniques involved simpler ingredients like marble dust, lamp black, and urine. Understanding and applying these methods can significantly extend the lifespan and performance of these natural resins.
For those interested in delving deeper into these materials, numerous old books on homebrewing and traditional techniques can be found on Google Books. Any book published before the 1950s will provide detailed recipes and methods for working with these eco-friendly materials.
Explore the rich history and potential of natural resins to find innovative solutions for your eco-friendly endeavors.