Tinder Fungus
Master thesis exploring the potential of tinder fungus for sustainable product design

Mushrooms are fascinating organisms that surround us everywhere. This master’s thesis focuses on the tinder fungus, a regional tree fungus with an extensive history and impressive properties. The goal of this thesis is to understand the tinder fungus in all its biological facets and reinterpret the role it once played for humans. The thesis serves to engage with the material and the possibilities it offers, as well as to question our handling of materials. The end product is not the focus here, but is intended to serve as an application example to rekindle the conversation about fungal materials, in this case the tinder fungus, and share the newfound fascination for fungal materials with others.

To design for the future as a designer, we should co-create with nature and rethink the paradigms of our consumption behavior and our production processes. The diverse expressions of bio-based materials already range from bio-plastics like PLA to materials made from bacteria, algae, fungi, or industrial food waste. The exploration and use of innovative bio-based materials is no longer just a design task but represents an intersection of design, material sciences, biology, and craftsmanship.

This intersection is found in the fungus “Fomes fomentarius”, also known as the tinder fungus. From the fruiting body of this tree fungus, a fabric and leather-like material can be obtained, which is still practiced today as a traditional craft in Romania. The material, also referred to as “Trama” or “Amadou Leather”, offers many interesting biological properties. The following work is concerned with exploring the possibilities of the material and testing its limits. These currently consist mainly of a lack of material stability, limited size due to growth, lack of homogeneity, limited color combinations, and the harvest and processing which is currently carried out exclusively by hand.

Institute
Dessau Department of Design

Student
Jessica Bösherz

Supervision
Prof. Dr. Manuel Kretzer
Prof. Nicolai Neubert

View Project

The structure of the fruiting body consists of a hard crust that is 0.5 to 3 mm thick. Underneath this hides a 2 to 3 cm thick, yellow-brown, tough-fibrous, but soft layer of trama. The texture of this layer is often compared to velvet or suede. Below the trama, the tube layers follow.

The interior of the perennial fruiting body can be filled with the brown tube layer up to 15 cm high in the lower area. This depends on the age of the fungus, but also on weather conditions and location. The mycelial core is located where the fungus is attached to the tree and ensures the nutrient supply of the fruiting body. This core is brown-white marbled and disintegrates into small parts under pressure.

Dyeing and bleaching of the material
Hydrogen peroxide (H2O2) is a colorless, largely stable liquid compound made up of hydrogen and oxygen. It is slightly more viscous than water, a weak acid, and a very strong oxidizing agent in comparison to most substances. In the textile industry, it is the bleach of choice for treating natural and synthetic fibers such as cotton, wool, silk, linen, and viscose. The use of hydrogen peroxide for bleaching not only allows a high degree of brightness but also preserves the mechanical properties of the fibers. Similar to pulp bleaching, this process takes place in a basic environment. It can serve not only as a strong bleach but also as a disinfectant. .

Design
During brainstorming to construct an application example to test the material in product form, three different directions emerged. One interesting concept was a stool made from a combination of self-grown mushroom mycelium as a base structure, and a cushion made from the tinder fungus fruit body. However, due to unsuccessful cultivation attempts, this idea had to be discarded. The next two ideas involved an upper garment made from the tinder fungus material, which was supposed to have a symmetrical cut with many cut-outs and smaller pieces of fabric, in order to incorporate as many successful material results as possible. The other idea was to integrate the material into the construction of on-ear headphones, as these products often use leather or fabrics, which require a pleasant touch.

After evaluating the material study, it was concluded that the on-ear headphones are the most suitable application example for the material. This is primarily because the material cannot be washed like conventional fabrics, which complicates its use in clothing. Furthermore, only small quantities of the material were available, which also supported the idea of the headphones.

Institute
Dessau Department of Design

Student
Jessica Bösherz

Supervision
Prof. Dr. Manuel Kretzer
Prof. Nicolai Neubert

View Project

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