The ordinary FoundationSerum 2.0 P - Light Medium

Our Serum Foundation delivers moderate coverage without a heavy-makeup look. Engineered to spread easily and blend seamlessly, the serum-like formulation has a real-skin finish and is compatible with most primers. The high-spreadability suspension system offers a natural look and resists collecting in fine lines. This formulation is designed to be suitable for all skin types and available in a range of 36 shades.

The shades are divided into four categories:
1 for lighter tones
2 for medium tones
3 for dark/deep tones
4 for deeper tones.

Each category is then classified further by a second digit from 0 to 4 to indicate depth within each category.
Finally, a letter is added to the shade code to identify the undertone:
P (Pink) and R (Red) indicate cool undertones
N indicates a Neutral tone
Y (Yellow) indicates a warm undertone

Three of the shades have an additional letter at the end which use natural-looking and exceptionally fine dispersions of metallic effect pigments for added highlight:
S indicates Silver highlights
G indicates Gold highlights