This edition starts with a recording of a performance lecture I gave recently as part of Fiber festival in Amsterdam, exploring the links between medieval alchemy and modern technology. The very technological and engineered means of delivering this lecture (microphone and amplification) are subjected to the described processes of dissolution. During the presentation certain minerals undergo high heat transformation resulting in the production of acids which will dissolve the metals and components of the industrially produced apparatus of communication, returning these to the noise and original chaos preceding their extraction and refinement. In the second part of this Substrat episode, the recording itself is subjected to an extended process of dissolution resulting in its untimely end. Many thanks to all at fiber and to Jussi Parikka.