Need some help with cadency

[Mike_Oettle]

While it is generally thought that white labels are a royal prerogative, this is misleading on two different scores.
Firstly, the labels used for members of the royal family are always blazoned as being argent (silver). Their appearance is white, but contrary to popular opinion, they are not intended to be white as distinguished from silver (this distinction largely exists only in Iberian heraldry).
Secondly, while in England there is a tendency for non-royals not to use argent labels, this is not an absolute requirement. And in Scotland, labels argent are as common as labels in any other colour – the primary consideration is one of contrast.
The use of the label argent in English royal heraldry goes back to Edward, the Black Prince. Previously all heirs to the English throne had borne the lions of England (without any additional quarterings) with a blue label, and some younger sons also used blue labels (with additional charges).
But since his father, Edward III, had claimed the throne of France and had quartered the fleurs de lis of France (in the prime position, first and fourth quarters) with England, a label argent provided the contrast required to stand out against both the blue and gold of France and the red and gold of England.
Since that time, every Prince of Wales has borne a plain label of three points argent on his shield.
All other royals have labels with specific additional charges assigned to them – with three, five or seven points as the case may be.
Regards,
Mike