Assuming you are using real anodizing dye; and not RIT or something else designed for cloth dyeing, its always best to follow the manufacture's instructions, including the recommended dyeing temperature. You can experiment after you have things working reasonably well. Dyes for cloth work poorly as anodizing dyes, they weren't designed for this.
There are some recent threads here on dyeing, I suggest you read them. pH measurement and adjustment is covered in these threads.
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