What this means for your foundation
Once you know your undertones, you can move on to choosing the right foundation for your skin. However, given the number of foundation lines and types, it may still take some trial and error.
Every brand of foundation is going to be slightly different, so your ideal shade may vary across different lines.
If the option is available, head to your local beauty store and see if an associate can help you swatch different shades. If you already have a match in 1 brand, they may be able to recommend or identify the best match in another product line.