A stain can look just right on the broad face of a board and much darker on its cut end. On a small wooden box, those ends may sit beside a clean side panel at every corner. A face-only colour sample misses the very spot that can make the finished box look uneven.
Save an offcut from the actual board with both a broad face and an exposed end. Mark its identity on a face you will not finish. If the box uses several boards or different woods, keep a sample of each rather than expecting one scrap to represent the lot.
Prepare the sample as you intend to prepare the box, following the stain maker’s sanding guidance. Support the scrap securely, sand away saw marks and remove dust. End grain often takes up stain differently from the long-grain face; do not flood it with extra stain in the hope of evening things out.
Apply the chosen stain to both surfaces using the same method and wiping time planned for the box. Let it dry as directed before judging the colour. If the end looks too dark, try a second sample with a finer final sanding on the end grain, where the product guidance allows it. Change one thing at a time and write down what you did.
If the maker recommends a conditioner or another pretreatment for that wood and stain, test the complete system on a fresh sample. Add the intended compatible topcoat after the specified drying time, because it can change the appearance again. Follow the labels for ventilation, protective equipment and rag disposal; oily finishing rags must not be left crumpled in a pile.
Practical takeaway: approve a corner, not just a flat colour patch. Hold the finished sample with its face and end visible together, then keep it and the preparation notes until the box is finished. A little contrast may be perfectly welcome; the point is to choose it before staining the whole box.
Wood FinishingBox MakingScrap Tests