One, to prevent enzymatic browning, reduce enzyme activity and isolate oxygen, such as adjusting pH value through acid-base treatment, altering protein properties through boiling or high-frequency heating, inhibiting phenolase activity with antioxidants, and isolating oxygen in water storage.

In preventing chemical discoloration such as light-induced, acidic/alkaline, iron, and enzymatic discoloration of wood boards, the wooden box factory primarily employs methods like coating with lacquer films to block external factors, or uses solvent immersion and chemical treatments to eliminate or modify the internal discoloration components of the wood.

To prevent color change, measures include blocking ultraviolet rays, altering the structure of light-absorbing components,隔绝oxygen and capturing free radicals, destroying the structure of substances involved in the color change, and removing precursors of discoloration.

Four, to prevent biological discoloration, alter or destroy the environmental factors suitable for the survival of microorganisms or organisms, such as temperature, humidity, pH value, oxygen, and nutrient components, through methods like water spray preservation, plastic sealing, and chemical treatment.