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If this photo comes through, it is the sunburst done as follows:
Feast Watson spirit stain golden oak and mahogany mixed with Japan black diluted with ordinary thinners.
first application, brush Golden Oak sealed with rattle can acrylic spirit based clear. Between uses I put the rattle can head down in a jam tin with thinners. Next brush edges with dark mahogany and gradually dilute the stain as you progress inwards. Sometimes you will need to blend hard edges with tired 400 grit paper. If you muck it up simply sand back and repeat.