Smoking (fume) process is reactive with Tannic in the timber with the Ammonia
In our color range, we have more than half of the colors will use the smoke process. Smoked color always seems dark/light in different shades, not able to control as it’s a natural characteristic.
Different Oak from different region has different Tannic, so after smoke it react different look:
Also there are 3 kinds of way of cutting the timber “Sawn cut”, “Slice cut” and “Rotary cut”.
Rotary and Slice cut are mostly used in making thinner veneers.
slice cut is cheaper in cost. But slice cut material needs to be soaking in the boiling water to make it softer before slicing.
So the timber color will tend to be darker, and the tannic in the timber will gets a bit change/less due to the reaction in the water.
So a color made by sawncut smoke is not able to be made by “slice cut smoke”.
They can still smoke the slice cut material, but the result will be different.
Since European Oak has a lot of Tannic in the wood, (well known from the wine industry). So many nice colors are made by smoking process. The smoked color will appears dark brown from the timber itself, looks more like aged/herritage, not same as the stained color.
With the time / temperature / and volume of Tannic, the color may be from light-dark different.
Different Oak such as Russian Oak, European Oak and Ukrine oak appears different color after smoke. this is depending on the Tannic level in the timber also other chemical stuff.
Also different time of Kiln dry and way of treatment will make the oak in different color after smoke.