Black stains on oak worktop

[barragirl]

I have black granite worktop saver unfortunately it had black felt pads underneath and the dye from that has gone on the oak worktop. Anything I can use to get the black marks off. Thanks

 

[JohnD]

are you sure they are not marks caused by damp? black damp mould stains on oiled timber are very common. I would not have expected a dye to pass through the oil (assuming you clean and oil it regularly)

look near the sink tap and you will probably find other black water stains.

if it is an oiled hardwood, you are going to have to clean the oil off the patches (wire wool and white spirit) and then either you can bleach the stains with peroxide, or if not bleachable you may have to abrade them away. You may need to use Ronson or other wood dyes to balance the colour before re-oiling.

 

[barragirl]

Think you could be right, I have used wire wool 0000 and white spirit and now I will try peroxide many thanks.

 

[big-all]

do not use steel wool use a plastic scourer
the tannin in the oak will react and oxidise the steel [black marks]
this is why you get black marks on oak doors gates and fences

 

[Deleted member 174758]

Oak (and walnut, too) reacts badly to the presence of water in conjunction with iron as Big-All says. The reaction is caused by the tannin in the wood dissolving into moisture to create tannic acid which in turn attacks any ferric compounds it comes in touch with to create ferric oxide, a black semi-permanent stain. the only thing I know of which will get rid of that is a solution of oxalic acid crystals in water. Try any good trade paint supplier for this - and remember to use rubber gloves

 

[big-all]

thanks joband knock makes more sense that its an acidic reaction rather than oxidation

 

[camilo]

jobs got it right with the oxcalic acid . mix the crystals in a plastic container and when dry wash with plenty of water to nuetralize . be aware that the acid is very toxic so be carefull aroung food areas