Tag: quality-control

Nobody has published a microplastic count for whisky. But the evidence from bottled water, beer and soft drinks points somewhere uncomfortable and specific — the particles mostly arrive after production, from purification media, equipment and closures rather than from the ingredients. For a spirit reduced to strength with water, that makes the water plant and the bottling hall the whole of the exposure.

Equilibrium does not care which liquid you pour into which — a 40% ABV spirit is a 40% ABV spirit however it got there. But the journey is not reversible. Along the way, parts of the liquid pass through strengths the finished product never sees, and some of what happens in those moments never undoes. Here is what the evidence actually shows about order, rate and agitation, in a proofing vat and in a glass.

Reduction makes a whisky visibly paler, and the arithmetic is unforgiving — cutting 60% ABV spirit to 40% spreads the same cask-derived colour across half again as much liquid. That is why colour is judged after the water goes in, why plain caramel is the only additive whisky law permits, and why the one thing your blending water must never do is contribute a colour of its own.

A bottler can specify its blending water to a decimal point and then serve the result in a glass rinsed with hard tap water and dried in the air. The mineral film, surfactant residue and chlorine left behind by that final rinse sit in the one place where every aroma compound has to pass. Sensory laboratories solved this decades ago by rinsing tasting glasses with deionised water — here is why, and what it means for a bar and a home shelf.

In a column still, live steam is injected straight into the descending wash, and steam sterilises the tanks and lines that later hold spirit and blending water. That makes boiler water a food-contact input in law — the US regulates the amines dosed into it by name and by parts per million in the steam, the EU by outcome, India by potability. Almost no distillery specification mentions it.

A cask is a water-handling vessel long before it is a spirit-handling one. Staves are seasoned in the open air for years of rainfall, bent with steam or hot water, leak-tested with water and pressurised air, and rehydrated with water when they dry out — and the wood taint that ruins a barrel is now traced to the seasoning yard. Every one of those waters has a specification, and the first line of it is the same as the one on a blending water certificate.