Finishing Floorboards - problems with previous varnish/stain

[feefeefifi]

Hi

We moved into a new place which had sanded/varnished floor however in fairly poor condition. So we hired a sander. The problem is the sander has taken back 99% of the floor to the original (pine we think) boards.
We have been left with small sections which we have tried to remove by hand. Have tried heatgun and nitromore to remove top layer of varnish but are left with a yellowy stain. We have tried hand sanding but it seems to be very deeply ingrained in places. Wirewool scrubbing and white sprit it not removing this 'stain' either.
We did a trial patch of our varish (Ronseal diamond in walnut) but you can see the two different colour through it.
The only think we can think of is to effective stain the whole floor this yellowy first... but dont know what to use.
Can anyone help?

 

[woodfinishes1877]

We've given this a bit of thought and think the only course of action is to use a bound water stain like Aquastain. This product has been designed to spread evenly over large areas and can be used under Waterbased (which I think the Ronseal product you have is) clear coatings.

You can see the full range of colours by clicking on this link: Aquastain Shades

I hope this helps but please come back with any questions.

Ian McAslan