Mixtures of polyol-and mono-alcohols. The rational selection of complex solvent mixtures and/or combination of the right reducing agents to perform NP syntheses is generally a tedious task . Exploring solvent mixtures with three or more chemicals is rarely a preferred option due to the inherent complexity of the approach in the selection process of those solvents and their relative ratios. The different pros and cons between polyols versus mono-alcohols has just recently been clarified. 20 With this knowledge at hand, we here explore the potential benefits of mixtures of alcohols. A driving hypothesis here is that the formation of the Au NPs is sensitive to the conditions under which the very initial steps of the synthesis take place. This hypothesis is motivated by the findings from a previous study focusing on different light environments, where a hybrid approach of light-controlled environment and dark conditions shows that the light conditions have a strong influence mainly at the beginning of the synthesis. The use of lights with low wavelengths to obtain small size NPs was mainly key in the first minutes of the reaction .