What might discolouration of sake lees indicate?

Discoloration of sake lees can indicate issues related to excessive storage or temperature fluctuations. When sake lees, which are the byproduct of sake production, are stored improperly—whether it's for too long or at inappropriate temperatures—their quality can deteriorate. This can lead to changes in color, which may suggest spoilage or oxidation.

Good fermentation typically results in well-preserved sake lees without significant discoloration, while aging properly would also not typically lead to negative changes in color. The quality of the rice used is fundamental to the overall quality of the sake produced, but it does not directly correlate with the visible changes seen in the lees themselves when they are improperly stored.

Hence, the correct understanding of the relationship between storage practices and the condition of sake lees is crucial in identifying potential issues in sake production and storage.