We recommend using WOCA Oil Color Testers to select the right color for your wood project. Different wood species and the wood’s natural color will impact the final color result. Using a color tester, you can sample different colors inexpensively. Ensuring that your project ends up with your desired color. Color Oil testers are available with Free Shipping in the USA, which is typically received in 3-5 business days. If you are in a hurry to receive your testers, you may choose an alternate shipping method.