Olonkulet Appendix Notes - Glow Wine
Glowcaps are a type of mushroom-forming fungus known for their bioluminescent properties. Under ordinary light conditions, the glowcap mushroom appears to be a pale brown toadstool, but in darkness a glowcap emits a soft green luminescence. Once picked this luminescence fades quickly and the mushrooms themselves are quite bitter and unappealing for raw consumption. The trick of glowcaps lies in their preparation. Dwarves regularly ferment glowcaps in large open trays of rotting fungus, collecting the run-off from the fermentation process at the base of the tray (1). During the degradation process, the body of the mushrooms is broken down, releasing cell membranes into the mushy run-off from the process, as well as the calcium deposits within the fungus. The fermenting vats and the extracted liquor both glow brightly as a result of the renewed bioluminescent action of the disintegrated fungus.
On a molecular level, the cell membranes of the glowcap are specialised to contain lumens (2) into which calcium can diffuse (3). As calcium diffuses into the lumen, a reaction is powered that generates bioluminescence in the form of pale blue-green light. This will continue until the system has reached equilibrium (4), whereupon no more light will be emitted. Dwarves can restart the process by shaking a bottle of glow wine or mixing about some of the glow mash (5), breaking the lumens and releasing fresh calcium. This will only work a certain number of times before the capacity of the glow wine/mash to produce light is lost. Another way is to add raw calcium (in the form of chalk or another calcium compound) to the mixture.
Glow caps are a staple of the dwarven diet and dwarven agriculture. Highly limited as the variety of viable underground crops are, glow caps provide much-needed booze, light and food (as the liquor can be dried and cooked as a sort of powder) in an environment drastically short on all three.
1) A solid substrate fermentation process, similar to the production of sake.
2) Small enclosed spaces within the cell.
3) Diffusion is where molecules travel from a high concentration to a low concentration.
4) i.e. There are equal concentrations of Calcium ions on either side of the lumen membrane.
5) Leftover solid mush from the fermentation that did not go into the glow wine, but still glows. This was the mash present in the glowbowls in the very first scene.