
Rachel Rosenkrantz makes guitars from sustainable materials. She created the "Mycocaster" using mycelium -- a network of threads made by fungi. Mycelium has been used in everything from biodegradable computer chips to eco-burials.

Rosenkrantz described the "Mycocaster" as having a surprisingly twangy and nasal sound, but says it can be calibrated to the player's liking. The shell and neck are made from compressed paper in resin, and scraps of upcycled wood are used on the shallow sides.

Mycelium can be grown in a mold to form any shape. To make a mycelium guitar body more rigid, Rosenkrantz adds dried fibers such as corn husk and fabric threads.

Guitars are often made from old-growth wood, but Rosenkrantz only uses wood that's reclaimed or ethically sourced. This guitar is made from upcycled parts, including a vintage cigar humidor box and a handle from an old suitcase. "All it takes is to have some ethics -- just doing the right thing makes a big difference," she said.

Rosenkrantz is also a beekeeper and realized that bees "hum" at a frequency towards lower-mid range of a guitar's sound. She says that bees amplify their humming through their hive's honeycomb structure, and was inspired to create the "Pawtuxet" guitar, which includes honeycomb.

To incorporate honeycomb, Rosenkrantz left a guitar soundboard in a beehive for a year.

Rosenkrantz has tried creating a banjo head that doesn't use animal skin or plastic. She's experimented with drying out kombucha, a fermented tea, so that it resembles leather.

Rosenkrantz with an early prototype of her kombucha leather banjo. "I'm exploring different techniques right now, but it's getting better every time," she said.

In this guitar, Rosenkrantz uses fish skin instead of plastic for the pick guard and other parts.
![During Covid-19 pandemic lockdowns, Rosenkrantz experimented with different biomaterial designs. Here, the "Honfleur" guitar is embellished with eggshells. "I eat two eggs for breakfast every day, and I [collected] all the eggshells," she said.](https://media.cnn.com/api/v1/images/stellar/prod/231030112634-rachel-rosenkrantz-guitar-image-11.jpg?c=original&q=h_447,c_fill)
During Covid-19 pandemic lockdowns, Rosenkrantz experimented with different biomaterial designs. Here, the "Honfleur" guitar is embellished with eggshells. "I eat two eggs for breakfast every day, and I [collected] all the eggshells," she said.

Here, Rosenkrantz is working on a guitar body made using basalt fibers.

Pictured, Rosenkrant plays a ukulele made from mycelium.


