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In an article about [penetrant
testing](https://en.wikipedia.org/wiki/Dye_penetrant_inspection)
([浸透探傷検査](https://ja.wikipedia.org/wiki/%E6%B5%B8%E9%80%8F%E6%8E%A2%E5%82%B7%E6%A4%9C%E6%9F%BB))
I found the following sentence:

> 浸透液は **水洗式** でハケ塗りとし，極力溶接部以外に浸透液が付着しないようにすること．

In this kind of test, a penetrant liquid is used on a surface (in this case a
weld area, 溶接部) to check if it has defects.

[Here](https://dictionary.goo.ne.jp/jn/116550/meaning/m0u/) I read that 水洗式
refers to a flush toilet, but in this context it doesn't make much sense to
me. Could it refer to a drainage outlet or something similar? I mean something
used during the test to collect the dripping of penetrant liquid?

Thank you for your help!
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2019-06-04T18:19:44.567
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2019-06-05T02:46:00.653
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question
meaning words kanji terminology
Meaning of 水洗式 other than flush toilet
水洗 **式** does not refer to a flush toilet itself, but it refers to a
method/system.

  * 水: water
  * 洗: wash / clean
  * **式: -type**

So 水洗式 (literally "water-wash type") can refer to anything that can be washed,
flushed or wiped with water. In layman terms it usually refers to a type of
toilet, but in this case, it describes a type of 浸透液. The Wikipedia article
you linked has a good explanation for this:

> The excess penetrant is then removed from the surface. The removal method is
> controlled by the type of penetrant used. **Water-washable** , solvent-
> removable, lipophilic post-emulsifiable, or hydrophilic post-emulsifiable
> are the common choices.

So:

> 浸透液は水洗式でハケ塗りとし、  
>  The penetrant must be water-washable and applied with brushes, ...
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answer