Trading Blox lets you specify the colors for most of the elements on the trade chart using the Trade Chart Colors section of the Preferences Editor.

 

Default Chart Colors:

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Editing Item Colors:

Click the chart item color display button so this image appears:

Selecting any of the colors shown and that color will as the item's color.  

 

If a different color is needed, click the above image area "More Colors" section and this next color dialog will appear:

This dialog allows a nearly infinite amount of colors to be used as a replacement color.

 

 

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