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9th trait (Nirnhoned) and 9 trait sets
Cat't really find answer to my question anywhere so I decided to ask here as there will be some of you masters who will know the big answer

I have leveled all professions to max level and learned all 8 traits exept Nirnhoned on all crafting professions and items. I also have finished the Craglorn quest and obtained and learned one Nirnhoned... Don't remember for which item it was learned. Today I went to Cyrodil to craft Armor Master set item and found that crafting was red so I quess it was because I have only one Nirnhoned learned... or am I right?
I have read that one char can learn only one Nirnhoned and if it's true, how can someone make 5 items if only one item Nornhoned can be learned?
Sorry about a little messy question but I'm not very good asking these in English