The factors that affect the chroma of vinyl acetate are as follows:

1. Impurities: Impurities in vinyl acetate will affect its chroma. Impurities may be introduced from raw materials, residues from the production process, or other external factors. The presence of these impurities may cause vinyl acetate to appear impure in color.

2. Oxidation: Vinyl acetate is prone to oxidation reactions when exposed to air for a long time, especially under high temperature conditions. This can cause the vinyl acetate to change color from colorless or light yellow to dark yellow or brown.

3. Light: Vinyl acetate is affected by ultraviolet radiation, which may cause changes in the molecular structure, thus affecting its color. Prolonged sunlight or exposure to strong light may cause color changes in vinyl acetate.

4. Temperature: High temperature conditions may promote reactions between vinyl acetate molecules and trigger degradation or other chemical reactions. These reactions sometimes cause stains or color changes in vinyl acetate. Vinyl acetate is an organic compound that is volatile and has a pungent odor.