For future note, put your question in body, as subject line gets truncated.

Format-cells, change font to white color, pattern to black

As for a gradual change, you could try formatting each cell progressively
less and less black. Say, 100%, 80%, 60%, 40%,etc. You can use custom colors
to get the exact level you want.
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Best Regards,

Luke M
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"Joe G." wrote:

I also would to add a 5 cell bar starting white and gradually changing to
black.