Ethidium Bromide Solutions Collect ethidium bromide solutions for disposal.
Ethidium bromide is mutagenic at higher concentrations.
Very dilute solutions of ethidium bromide may be discarded by flushing down a sanitary sewer. The maximum concentration for doing so is a working solution of 5 ppm or less. Do not intentionally dilute any solution to avoid proper disposal methods. Ethidium Bromide Gels Ethidium bromide gels should be collected in double wrapped plastic bags. Excess buffer should be removed before wrapping or absorbed into paper towel.