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Wood Treatment Guide

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Wood treatment is performed in a Wood Treatment Tank, using small amounts of various chemicals to treat from 1 to 500 Boards at a time. By adjusting the time of treatment (amount) and order of application of these chemicals, the attributes of the boards can be gradually adjusted until they reach a specified goal.

Each wood treatment tank works slightly differently (see #K-Values below), so recipes are usually tank-specific. However, because treatment resources come from the player's inventory (and boards are usually removed from the tank immediately), tanks are often made Public, with tested recipes listed on the wiki.

If you have a recipe already, just put your boards in the tank and apply the chemicals in the order given, for the length of time given. Remember:

  • Only plain boards may be put into the tank.
  • If the boards have no named properties, they can be removed from the tank as plain boards (reset to untreated board attribute values).
  • While any boards you have put into the tank may be altered repeatedly, you cannot alter them again once they have been removed.
  • Volume counts. 10 seconds of treatment costs the same as 1 second (1 deben of resource for every 10 seconds, rounded up); 500 boards cost the same to treat as 1.
  • If it isn't mentioned in the requirements, it doesn't affect you. That is, if you need "Rigid boards", any board type with "Rigid" in the description works. Rigid Glossy, Rigid Blond, Rigid Black, all would work.

Board Attributes and Properties

During the treatment process, boards are measured on 8 scales: Flexibility, Cuttability, Flammability, Water Resistance, Insect Toxicity, Human Toxicity, Darkness and Glossiness.

When the value of an attribute becomes particularly high or low, the board will gain the associated property, as noted below.

Property Very Low
Very High
Flexibility Rigid Pliable
Cuttability Hard Soft
Flammability Fireproof Volatile
Water resistance Rotproof
Insect Toxicity Termite-prone Termite-resistant
Human Toxicity Nontoxic
Darkness White Blond Black
Glossiness Glossy

Boards may have (and generally will need) more than one property. Thus, one of the goals of wood treatment is to find the appropriate balance among attributes to achieve the desired set of properties.

NOTE: Boards with extra properties will be accepted by the building construction site. In other words, rigid hard blond boards can be used in buildings requiring rigid hard boards.

Treatment Chemicals

Boards in the tank may be treated with any or all of the following resources: Ash, Beeswax, Lead, Lime, Oil, Petroleum, Potash, Saltpeter, Sulfur or Water.

Every 10 seconds of treatment consumes 1 deben of the resource (rounded up). (For example, 385 seconds of beeswax treatment would require 39 deben of beeswax.)

Each chemical has an 'ideal' set of values for the attributes, and will attract the boards' attributes toward these ideals. In the following table, the numbers represent pixels of the blue bar on the tank screen.

  • A value of -3 means there are no blue pixels left visible on the bar.
  • A value of 69 is the highest possible value, with a fully blue bar.

Ideal Values
Ash Beeswax Lead Lime Oil Petroleum Potash Saltpeter Sulfur Water
Flexibility 33 69 45 5 -3 53 37 21 61 13 29
Cuttability 33 53 37 5 21 29 13 61 69 -3 45
Flammability 33 -3 37 21 5 45 69 13 53 61 29
Water Resistance 26 21 69 29 45 53 61 5 13 37 -3
Insect Toxicity 22 37 21 69 5 13 61 29 53 45 -3
Human Toxicity 15 45 37 61 13 29 53 21 5 69 -3
Darkness 33 45 37 69 -3 53 61 5 13 21 29
Glossiness 4 -3 69 29 13 61 53 5 45 21 37

The attraction behaves like a magnet; a strong effect when the attribute is already close, and much weaker when the attribute is far from the ideal. Once the attribute reaches the ideal value for that chemical, further application of that chemical will not move the bar any further.

For example:

  • Untreated boards start with a Human Toxicity value of 15 and Darkness of 33.
  • Water has an ideal Human Toxicity value of -3 and a Darkness value of 29.
  • Applying Water to the boards will move the Darkness bar quickly (since the ideal value of 29 is close to the starting value of 33).
  • At the same time, Water will move the Human Toxicity toward -3, but at a slower starting rate.
  • Once the Darkness hits 29, the Water will no longer move this bar further down.
  • Additional Water will continue to move the Human Toxicity bar, however, (increasingly quickly as it gets closer to -3).


If you are just following a known recipe for a specific tank, you can skip this section.

K-Value is a term that was invented during Tale 1. It refers to the rate of speed at which a given bar will raise/drop for a particular wood treatment tank.

  • Each attribute (Flexibility, Cuttability, etc.) will have a different K Value.
  • Every Wood Treatment Tank has a different set of K Values.

Once you calculate the K Values for your specific tank, you can then use a simulator to predict with about 99%+ accuracy the results of any given recipe.

Calculating K Values

The general idea is that you want to measure the amount of resources (seconds of treatment) required to change one of the bars from a given known starting value to a given known final value.

  • The further apart the two known values are that you are testing, the more accurate the K Value you calculate will be.
  • In other words, if you only test the Glossiness range from 4 to 13 (difference of 9), you will have a much less accurate result than if you test the full range from -3 to 69 (difference of of 72).

The formula used to calculate the K Value is:

(End Value - Start Value)2
(2 * ResourceSeconds)

NOTE: To Test K Values you only need 1 board to be loaded into the treatment tank.

An Example

We know that an untreated board starts with a Glossiness of 4 by looking in the table above. If we used beeswax to shift the glossiness higher, it would eventually reach 69, again according to the table. Thus, the Start Value will be 4, and the End Value will be 69.

  1. Put a board in the tank.
  2. Treat with beeswax, keeping track of how many seconds total are needed to fill the Glossiness bar completely (value 69).
  3. Let's assume this takes 460 seconds in this example. This value is the ResourceSeconds.
  4. Calculate the Glossiness K-Value:
    (69 - 4)2/(2*460) = 652/920 = 4225/920 = 4.5923913
So the Glossiness K-Value in our example wood treatment tank is: 4.5923913 

At this point, we can see that the beeswax treatment should have also maxed out the Water Resistance at 69. So to calculate the Water Resistance K-Value, we will need to drop the Water Resistance as low as possible from that high starting point.

The resource Water actually lowers the water resistance, and it will take it all the way to -3. So our Start Value is 69, and our End Value is -3.

  1. Apply lots of water to the board from the previous example until the water resistance bar is completely gone.
  2. Let's say that took 593 seconds of water treatment exactly.
  3. Calculate the Water Resistance K-Value:
    (-3 - 69)2/(2*593) = -722/1186 = (2*5184)/1186 = 4.3709949
So the Water Resistance K-Value in our example wood treatment tank is: 4.3709949

Now we can see on the chart that the Insect Toxicity should currently be -3 (no bar visible). We therefore want to raise Insect Toxicity as high as possible to get a good calculation.

Lead is what raises the Insect Toxicity the most (to 69) but it is a fairly valuable resource, so isn't very desirable for testing. We can also see from the chart that Petroleum would raise it to 61 but is also a valuable resource. However, the chart says that Saltpeter will raise the Insect Toxicity to 53 and is a cheap material so we will use that.

Thus, our Start Value is -3, and our End Value is 53. However, since the bar will not be maxed out, we can't use that clue to let us know when we've reached 53. Since it won't go any higher than 53 though, we know that when the bar stops going up we've reached 53.

  1. Apply lots of saltpeter, keeping an eye out for when the bar stops moving.
  2. Lets say for this example this takes us 374 seconds of saltpeter.
  3. Calculate the Insect Toxicity K-Value:
    (-3 - 53)2/(2*374) = -562/748 = (2*3136)/748 = 4.1925133
So the Insect Toxicity K-Value in our example wood treatment tank is: 4.1925133

Continue in this fashion until you have determined all 8 K-Values.

Finding Recipes

Once you have your K-Values, you can use a simulator to find a new recipe for a given type of boards.

REMEMBER: The closer the value for some attribute is to what the "ideal" for the treatment chemical is, the more effect it will have.

To be added


Wood Treatment Calculator by Larame

A Wood Treatment calculator and simulator. Requires Windows and .NET Framework 4.5. Upon first run, Click Menu -> Settings and set your Treatment Tank's K-Values.

Public Tanks and Recipes

Related Pages