Documentation
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Reference
Preferences
Cell Options
Cell Frame Options
CellFrameColor
• CellFrameColor is an option for cells that determines the color of the frame around a cell.
• The color is specified as an RGB or GrayLevel directive, using the "Color Selector" dialog box. Color specifications using Hue or CMYKColor are allowed, but these are automatically converted to RGBColor by the front end. The default setting is CellFrameColor 
GrayLevel[0].
