The main RuneScape Wiki has an article on: Yellowdye
The Old School RuneScape Wiki also has an article on Yellowdye.

Nicknames None
Released 8 December 2001 (Update)
Quest item No
Members item No
Tradeable Yes
Equipable No
Stackable No
High alch 3gp
Low alch 2gp
Shop price 6gp - General Store
Sale price 2gp - General Store
Examine A little bottle of dye

Yellowdye is an item which can be made by giving Aggie in Draynor Village 5 coins and 2 onions. This item can be used to change the colour of a cape, giving the player 2.5 Crafting experience. The dye can also be used on Reddye to make Orangedye which can then be used for the Goblin Diplomacy quest, or alternatively the dye can be mixed with Bluedye to make Greendye.

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