Positive designation and most important attribute for the colour of a wine in the context of a wine address (in verbal form) and wine evaluation (by means of point system). Other designations, some of which are used in combination and vary according to wine type or wine colour, are bright, sparkling, brilliant, torch-bright, glossy, crystal clear, mirror-like and transparent. To determine the clarity of a white wine in particular, hold the tilted wine glass against a light source against a bright background. A clear wine always has brilliance, it shines even with darker colours.
A deep red wine cannot be transparent, of course, but it can be very clear. The highest level of this is also called black gloss. This is derived from a common method of determining clarity. The filled red wine glass is viewed against the light in front of a dark surface. Possible clouding would become visible by brighter reflections. An absolutely clear red wine, on the other hand, will appear black due to a lack of reflections. An earlier often used term for clear red wines with simultaneous colour depth is torch light (the ethymological meaning is not known, however). Cloudiness or a cloudy, flaky texture indicates a wine defect. A whirled-up deposit is to be avoided as far as possible, but does not mean a defect or fault. A related term of clear is clean (so to speak unclouded). Negative terms are blind (opaque, cloudy) and dull.