Very old vintage ports. With extreme age eg. 30-100 years, the colours may have faded and lighter hues are acceptable.
Dry sherry. The colour is very dependent upon the style, eg. A fresh Manzanilla could be very pale straw colour, whereas a Pedro Ximenes might be deep brown. When assigning the numbers one should be cognisant of the grape variety and style of sherry being assessed.
Muscat/Tokay/Madiera. Extremely old examples may have more amber/onion brown hues, and these should be considered as rating very highly given the age of the wine.