Worksheet for your project
Your record of samples on the slab
Print this sheet and fill it out with your installer for each sample on your slab. Keep your photos and product info with your quote (one folder for all of it works fine).
Take a photo of each sample in the same light, note where the sample is and write down the actual products used. Check each sample in daylight and again under your evening lights before you sign off. A photo keeps a record of each sample, but it can't show you the exact color of the finished floor.