Plywood Industry

Blue stain on veneer

Blue stain on veneer

"Blue stain” spots on the veneer sheets are a reaction of tannic acid from the wood and the iron in the steel of the knife and/or the pressure bar.

This phenomenon can be found in wood species with high tannic acid content such as red or white oak, cherry and walnut.

To avoid blue stain spots on the veneer sheets:

  • Use TKM NOVACROM quality for knives
  • Use TKM stainless steel for pressure bars
  • Always keeping the cutting tools as clean as possible

Do you need further information?

We could not clarify your individual request, or you have a question concerning another topic?

Then we will be happy to help you by phone: +49 2191 969 325 or by e-mail at:

You can also send us your message using the following contact form.