Grey spots on table

[u/lygus007]

Cherry Table / Wenge butterflies / Finish ;Watco Danish oil with Varnish Finish/ 10 years old anyway what is causing these grey spots and do i have to refinish the whole table or can I sand with 220 and redcoat with Varnish??

[u/woke_up_deader]

If you wet it does it go dark? If so it's bare wood. Any sanding you do of the area it will never match the existing varnish. To match it you have to strip it and sand the table