1. Check the specific PhotoReady formula: Are you interested in Candid Antioxidant Concealer, Candid Antioxidant Setting Powder, or PhotoReady Foundation?
2. Visit the Revlon website or a retailer's website (like Ulta or Amazon): Look at the shade range available for each formula.
3. Look for the highest number shade. Typically the shade with the highest number is going to be the darkest.
I can give you a more precise answer if you specify which PhotoReady product you're interested in!