90° alcohol

Ethanol diluted to about 90% by volume, sold in pharmacies and often denatured to make it undrinkable.

Characteristics

About 90% ethanol and 10% water by volume.
Mixes with water in any proportion and dissolves oils and resins.
Denatured versions contain additives that make them unfit to drink.
Highly flammable: gives off flammable vapour at room temperature.

Role in the preparation: Used as an extraction solvent for tinctures and macerations of plant material.

Caution: Keep away from flames, sparks and heat, store closed in a cool ventilated place, and wear gloves and goggles when handling.

Sources: Lab Alley – Ethanol overview · UC Santa Barbara – Standard Operating Procedure: Ethanol

Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.