Winsor & Newton has a wonderful educational website that gives all sorts of painting tips you can sign up for. This is a sample from their website. Check them out! https://www.winsornewton.com/na/discover/tips-and-techniques/
Name of range: This identifies the colour range.
Colour name: This is the name of the colour. These are not necessarily unique to a range or medium, e.g. Cerulean Blue exists in Watercolour and Oil Colour.
Series number: This indicates the relative price of the colour and is determined mainly by the cost of the pigment. Series 1 is the least expensive and Series 5 is the most expensive.
Colour swatch: Shows how the colour will look when painted out, without having to open the tube.
Quantity: Indicates how much paint is in the tube.
Permanence rating: The Winsor & Newton classification of permanence measures not only lightfastness but also film & chemical stability of the paint. Ratings are labelled as:
AA - Extremely Permanent
A - Permanent
B - Moderately Durable
Pigment Content: Each pigment can be identified by its Colour Index Generic Name. As an example: Cobalt Blue is Pigment Blue 28, abbreviated to PB28. More than one pigment abbreviation indicates multiple pigments.
Opacity: Symbols are used to represent the transparency/opacity of a colour. Transparent colours are marked with , semi-transparent colours are marked . The relatively semiopaque colours are marked with and the opaque colours are marked with .
Lightfastness: This is shown with an ASTM rating for the pigment. The ASTM abbreviation stands for the American Society for Testing and Materials. This organisation has set standards for the performance of art materials including a colour's lightfastness. In this system I is the highest lightfastness available, though both ratings I and II are considered permanent for artists' use.
The AP (Approved Product) Seal: The symbol here identifies products which are certified by The Art and Materials Institute (ACMI) as art materials that are safe and certified by a medical expert to contain no materials in sufficient quantities to be toxic or injurious to humans, including children, or to cause acute or chronic health problems. ACMI’s toxicology team is located at Duke University, USA.