Thank you so much Wiking and ToneTW for your wonderfull responses.
Three weeks ago Kostis Ornerakis wrote this to me:
Kostis Ornerakis wrote: When I want to give wood an aged look, I put it in an airtight plastic food container with vinegar and steel wool. After a day or two I dry it in the oven.
So Kostis, I did not forget about your suggestion. See what happened:
I build this gate a while ago after a depiction of the Nereid Monument I took in the British Museum.
It is surprising to see how little wall space is left between the doors and the battlement on top of it.
If the original depiction represents realistic proportions (but often it does not) the wallwalk above the gate can only be made of wooden beams.
These beams are cut out of the same styrodur block as the walls. The result is a very rough wood structure.
Using the full hight of the townwall this creates space for a majestic gateway.
But to my taste the styrodur structure of the doors is too rough.
The design of these doors is based on the 'Gate of Troy' on the 'Francois Vase' in the Louvre, Paris. This Archaic Greek vase dates from the 6th century BC and is (as usual) not showing bronze age (Troy) but contemporary fashion and architecture.
The construction of this door is puzzling me. I see vertical planks and horizontal studded enforcings. But two crossbeams go UNDER the horizontal studded enforcement beam in the middle. That means 4 layers of wood over another, or at least 3 since the two crossing beams can be expected to be 'sunk' into each other by cutouts.
My interpretation is a little different:
But look at the wormholes in the wood, created by the structure of the styrodur foam.
Both doors together were cut out of one styrodur piece.
So I followed Wolfgang Meyers example he showed in his Crobern farmhouse WIP pics. The same gate doors but made of balsa wood this time. I used 5 different layers to create both a base, two layers of vertical planks and two additional layers of decoration/enforcing planks.
I used waterproof white glue so I can treat it with liquids without falling apart.
And now comes the part where I have to get rid of the IKEA look of the wood by using Kostis' instructions.
I did not trust the glossy steelwool sponge from my kitchen so I searched my house for other rusty and metal materials.
Many questions were rising: does it have to be steel or iron? Does it have to get rusty or only create a non visible chemical reaction? Is airtight important? Is drying in the oven important or can I dry it in the open air as well?
Together with the most promising steelwool, rusty iron and cleaning vinegar I put both doors in a plastic container.
I closed the container and waited for two days juist like Kostis said.
The result was disappointing. I expected some lively brown and grey weathered doors. What did I do wrong?
After open air drying there was a bit of result visible, compared to the original balsa color.
I read Kostis' words again and again and searched the internet for additional information. I created a bunch of testing containers, with natural vinegar and different kinds of metal.
Apple vinegar....
... gave this test piece a yellow color.
I expected the acid and metal to create strong colored liquid but that did not happen. After six days in the container my city gate doors looked like this:
Very disappointing again since it still looked like it already did after 2 days. But now the waterproof white glue was swollen and visible at some of the joints.
So now the only thing I had left was trying to dry it in my oven.
And look what happened only after a few minutes:
Very dark color appeared, like tropical wood. So what happened? Probably it is all about the chemical reaction between acid and metal that becomes best visible after drying in great heat.
Here is the difference between 6 or 2 days in the pot and oven dried afterward:
Of course I could have painted the blanco balsa wood like I did with most of my pinewood river boats. But then part of the woodstructure gets lost.
Kostis thank you so much for your help. As usual with you, every one of your words made sense at the end and I finally succeeded!
By removing the excessive glue with a knive a new problem appeared: I damaged the wood. So I had to grind and file it a bit.
Also the front lacks the bronze studded plates.
To get a good metal look I used soft metal wrap from a champaign bottleneck.
Studs are created by tipping 1 dark brown spot and 4 layers of bronze paint with a pointed brush.
I am very happy with the result. No more styrodur doors for me from now on.
The Greek mercenary hoplites are from Newline Design.