In synthetic chemistry, the FAIR principles must not be reduced to data and descriptive metadata alone. Chemists can provide more than data for documentation and subsequent use. Very often, chemists can substantiate results by synthesis products and thus provide physical evidence of the research work and its quality. Where the reaction products obtained are stable, they can be collected, stored and registered so that, if suitable, the work result can be used directly for further studies. Examples of such direct re-use could be the independent reproduction of experiments, the use of the chemical samples for reactions or the analysis of the samples by characterization or screening techniques. The reusable collection of samples promotes transparency. Numerous scenarios are conceivable in which such stored substances accelerate knowledge gain, especially when they are unambiguously linked to other research output like journal publications and research data.