What time period? White Ensign sells the IJN colors you'd need, but more importantly, they also sell the paint chips for the IJN grays.
There were several yards that built and refit warships, Kure, Sasebo, etc...and each had their own particular shades of paint. Depending upon where Ise received her last refit, that's probably the color she wore.
Drop a line to John Snyder at www.whiteensignmodels.com
Jeff Herne