MeshStyle is an option for Plot3D, DensityPlot and related functions which specifies how mesh lines should be rendered.
MeshStyle can be set to a list of graphics directives including Dashing, Thickness, GrayLevel, Hue and RGBColor.
See the Mathematica book: Section 2.9.3.
See also: Mesh, AxesStyle, Prolog, Epilog, DisplayFunction.
The second plot colors the mesh lines.
Evaluate the cells to compare the graphics.
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