Plant-based Patination on Copper and Brass for Metalcraft: A Study on 20 Thai Fruits and Vegetables

Abstract

This practice-led research investigates plant-based patina solutions as an environmentally friendly alternative for patinating copper and brass (0.1-1.0mm thicknesses). Focusing on Thai fruits and vegetables found in the Bangkok area, the objectives of this research are: 1) To experiment with various Thai fruits and vegetables, evaluate their ability to yield distinctive and desirable results, and catalog them as sustainable alternatives to conventional chemical solutions for practical metalworking applications, 2) To identify sources of design inspiration and design elements within the results of the plant patination method, and 3) To demonstrate the application of the unique aesthetic properties of plant-based patinated metal.

Basic research revealed that 20 fruits and vegetables were effective as alternatives to traditional chemical solutions, producing a range of patina colors including green, iridescent, brown-black, and violet-gray. Three attributes of plant-induced patina—Color, Texture, and Shape—were found to be applicable to metalcraft items. Through experimentation with non-soldering joining techniques, this research demonstrated environmentally friendly metalsmithing with outputs that resonate with the philosophical principles of sabi, offering a refreshing alternative within the field. This approach introduces new craft and design possibilities and promotes safer working conditions in the patination process for artisans and designers in metalsmithing.

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