Mixtures of alcohols such as mixtures can be used as source of reducing agents for the RT synthesis of stable SF Au NPs in alkaline aqueous media. Based on evidence from UV-vis characterization and STEM microscopy, a benefit of this approach is that even small amount of glycerol around 2 v.% for a total amount of alcohol between 5-20 v.% improves the Au NP size control towards lower sizes by favoring a faster formation. The strategy to use a smaller overall amount of chemicals to obtain small size NPs ca. 5 nm in diameter present several potential benefits for scaling the NP synthesis but also further uses in various applications.