Factorio Forums

Apparently both Holmium Solution and Electrolyte allow the use of quality modules in them. The quality versions of the recipe also exist and can be selected when setting recipes for the applicable production structures, this, despite being fluids and clearly *not having quality* as is evidenced by the latter recipe's non-normal versions only asking for the Stone to be of the applicable rarity.

The quality recipe versions exist so we can make electrolyte and holmium solution using quality ingredients. As for the quality modules, IIRC it's made that way so you can use circuit-controlled recipe setting without having to eject invalid modules when you select a recipe that couldn't use them.