Main wrapper background color

I have a problem with suffusion, I changed the background color of the main wrapper of the suffusion theme to yellow (#ffc000) on ly for testing, the problem I have is that I cannot return to original color, if I change skin the bacground of the main wrapper stay yellow, with all skins.

I reviewed all colors setting and they are now to the correct color, but the main wrapper background stay yellow. I uninstalled suffision theme and reinstall it, but the main wrapper background stay yellow. I set the main backgroud to blue, but the main wrapper background stay yellow.

I search for ffc000 color in My SQL database using PHPMYADMIN, I do not find this color in database.

Please indicate how I can clear all settings of Suffusion (Note: I tried the reseset feature in configuration page).