oversaturate
/ˌəʊvəˈsatʃʊreɪt/ /ˌəʊvəˈsatjʊreɪt/verb
[with object] To saturate excessively; to provide with more than sufficient of a substance for saturation. Also without object: to become oversaturated.
Origin
Mid 18th century; earliest use found in The Gentleman's Magazine. From over- + saturate.