Yellow at 45.
Grey at 85.

Yellow at 45 cooking skill.
Green at 65.
Grey at 85.

You can buy this in UC/tirisfall glades or TB/mulgore
Really great way to farm cooking/fishing skill in the beginning ;)

As of Mists of Pandaria, this doesn't go gray until 100.

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莉兹白·克伦威尔 is in 幽暗城.

you can find her there:

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she can sell the following items:

小知识

屏幕截图

视频

食谱：美味小鱼

物品等级：1

售价: 10

最大叠加: 20

售价: 1

[Vendor Locations]

[This item can be purchased in] 幽暗城（4），暗月岛（4），雷霆崖（4），提瑞斯法林地（2），暴风城（2），洛克莫丹（2），提瑞斯法林地，新工匠镇，泰达希尔，艾尔文森林，和莫高雷 .