These terms are commonly abbreviated as either GNS or NGS. A product made from grain is "neutral grain spirit", while a spirit made from grapes is called "grape neutral spirit" or "vinous alcohol". In particular, large quantities of neutral alcohol are distilled from wine and/or by-products of wine production ( pomace, lees ). Neutral spirits can be produced from grains, corn, grapes, sugar beets, sugarcane, tubers, or other fermented materials such as whey. Ethanol is a commonly used medical alcohol, spiritus fortis is a medical term for ethanol with 95% ABV. However, rectified spirit is typically distilled in continuous multi-column stills at 96–96.5% ABV and diluted as necessary. The purity of rectified spirit has a practical limit of 97.2% ABV (95.6% by mass) when produced using conventional distillation processes, as a mixture of ethanol and water becomes a minimum-boiling azeotrope at this concentration. In some countries, denatured alcohol or denatured rectified spirit may commonly be available as "rectified spirit", as in some countries (though not necessarily the same) the retail of rectified alcohol in its non-denatured form is prohibited. Rectified spirit, also known as neutral spirits, rectified alcohol, or ethyl alcohol of agricultural origin, is highly concentrated ethanol that has been purified by means of repeated distillation in a process called rectification. Rectified spirit made in Poland by Polmos
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