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I bought some 2x4s from homedepot. Took a picture of the stamp. How can you tell if it's treated or not? Is it safe for indoor furniture project?

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Easy way: did you buy it INSIDE the store? - then it's not PT - they store that out where it can stay nice and wet.

That's a KD (kiln dried) stud - it's not PT. It's not greenish, as well, which is a somewhat blatant clue.

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    thank you so much. Just want to make sure I got it correct. KD means the wood was held at a high temperature for a certain amount of time to kill any insects hiding inside. Does not involve any chemicals, so its safe to use it for any indoor projects. – qinking126 May 22 '16 at 15:58
  • KD (no numbers) means it was dried below 19% moisture when planed. HT means it was heat treated adequately to kill insects (which is normally the case for KD lumber, but the two mean different things) – Ecnerwal May 22 '16 at 16:31
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    @Ecnerwal, "big box" stores in my area store pressure treated lumber indoors with the rest of the lumber. – Jimmy Fix-it May 22 '16 at 16:56
  • Treated lumber isn't necessarily green, so that is not a blatant clue. For example, ACQ-B treated lumber will look greenish (unless it has been stained dark brown so it looks more appealing as fence posts or decking), and ACQ-D treated lumber will be a light brown color. – Craig May 23 '16 at 3:17

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