Fixatives are substances used in various fields, such as biology and art, to preserve specimens or materials. In biology, fixatives help maintain the structure and integrity of cells and tissues for microscopic examination. Common fixatives include formaldehyde and ethanol, which prevent decay and degradation. In the realm of art, fixatives are sprays or solutions applied to drawings or paintings to protect them from smudging and environmental damage. Artists often use fixatives to ensure their work remains intact over time. These products can be temporary or permanent, depending on the desired level of protection.