When people first read herbal texts, the words infusion, decoction, and tincture can blur together. Treating them as vocabulary rather than as a menu of remedies is the more useful approach. Knowing what each word historically meant helps a reader follow an old monograph without mistaking description for instruction.
An infusion, in the traditional sense, was made by steeping the softer parts of a plant — leaves and flowers — in hot water. A decoction involved simmering tougher material like roots and bark. Both are water-based, both have been part of household and apothecary practice for a very long time, and both are described here only to explain the terms, not to direct anyone to make them.
A tincture is different in medium: it traditionally used alcohol, sometimes alcohol and water, as the solvent rather than hot water alone. The point of the distinction in the old texts was that different solvents pull different constituents from a plant. That is a fact about chemistry and tradition, and it is part of why the word existed as its own category.
It matters to a careful reader that these forms are not equivalent. The same herb prepared as a water infusion and as an alcohol tincture is not the same thing in concentration or in what it contains. Old texts knew this, which is why they named the form so precisely. We repeat the distinction so that readers do not flatten it.
None of this should be read as a how-to. We are describing what the words mean and why a tradition kept them separate, not telling anyone to prepare a remedy, and certainly not suggesting strengths or amounts. The alcohol content of tinctures alone is a reason that questions about them belong with a qualified healthcare professional, especially for anyone avoiding alcohol, pregnant, or taking medications.
Read as literacy, tea and tincture stop being a shopping decision and become two entries in a shared vocabulary — terms that let a reader understand an old page accurately, and ask better questions of a professional when an actual decision is on the table.