black stain after milling silkyoak a problem ?

**JDarvall** · 19th December 2011, 07:06 AM

Hi, I thought this may warrant a question. Quite new to millling.

I've got my silky oak milled. And I noticed as some boards came off there was a stain pushed into the dust....black. Felt it was some kind of reaction to the steel in the milling gear. Though I don't really know of course.

But will this stain absorb deep into the timber ?

The miller says its not a problem, but the reason I ask because while working silky in the past I've come accross a similar sort of stain that had the same sort of pattern. Can't remember exactly but I remember it being a problem in that it dug in a bit, and had to thickness off a lot to get rid of it. Talking something significant like 10mm. Ruined the look and no way to get rid of it otherwise.

But, really not sure if its the same thing.

Want to know, because I'd prefer to deal with it now somehow, than realising the loss latter. uno. The designs I have in mind arnt flexible enough that I can just thickness it out.

appreciate any thoughts

thanks
Jake

**Scribbly Gum** · 19th December 2011, 08:46 AM

Looks similar to the stains that freshly milled hardwood (eucalypt) gets when milled green. I have never seen it penetrate the timber.
Jake, your silky oak looks very fresh and will need to dry out a lot before you can use it.
Happy Xmouse
SG

**KevM** · 19th December 2011, 08:49 AM

I've found that I need to wash all the boards off the band saw down with water immediately following milling, this will get rid of the majority of the discoloration and any residual sawdust which can cause staining with some timbers during the drying process.

**timboz** · 19th December 2011, 12:19 PM

Jake,
The black stain is as you suggest, due to a reaction between the wood and the steel in the blade. It is actually iron tannate, formed from the reaction between tannic acids in the timber and iron in the steel. From that source it won't present a problem but if you leave a steel object on the wood and out in the rain it can become deeply stained. If you are concerned it can be removed by applying a solution of oxalic acid (say 2 tablespoons to a litre of water). Oxalic acid can be purchased from Bunnings.
Hope this helps, regards Tim.

**Sigidi** · 19th December 2011, 02:53 PM

Looks really similar to kind of stain you get if you happen to do some grinding near green timber and don't make sure the grinding is orientated away from the timber. does this always happen with bandsaws??:O

**JDarvall** · 19th December 2011, 08:16 PM

thanks kindly. I won't worry about it.

Happy christmas too.

**nifty** · 19th December 2011, 09:24 PM

If your silky was bandsawn that colour is something you will see as the blade starts to get dull, nothing to worry about

**JDarvall** · 21st December 2011, 07:33 AM

it was bandsawn. sounds like it . ta.

**eli szoko** · 22nd December 2011, 10:03 PM

Have done 5 years in large timber mills hard and pine,cut sillky on me lucas,sawn and slabed and have never seen this.

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