First, check to see whether the method of Han's is worked.
If it cannot solve the issue, then try to change the default printer to a different printer and check.
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Found the solution. Has nothing to do with the printer. I was using a high-contrast theme. When I chnaged it back to a default theme, the Ecel fonst show in color.
You can try it to verify.
Strange there doesn't seem to be anny mention of this.