colors of trading objects in dwarf fortress

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I got goods to be traded on the trade depot. With help of trader started the trade. on the trading screen the goods i have were in brown colored text (except 2).
what does these color mean?
From my observation in this case the cages were the white ones. any particular reason?
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Quick Answer about "colors of trading objects in dwarf fortress"
- Brown Items have been created (or modified) by your fortress. ...
- Gray Items were created by another source. ...
- Purple Items are under a no-export mandate. ...
- Green Items have just been gifted to the caravan and they will not trade it back.
Dwarf Fortress - Tarn and Zach Adams Talk - New player Tutorialization and a impending Release date.
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