I'm assuming you were trying to ask the question, "How do I make yellow dye?", because there's no such thing as yellow food dye in runescape--you can't dye the food in there. Two onions and 5 coins, given to the witch Aggie in Draynor, will produce yellow dye.
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Orange dye can be made by putting yellow dye (from crafting yellow flowers) and red dye (from crafting red flowers) on the crafting table.
you can make yellow blue red dyes in runescape. to make the dyes you need to go to aggie the witch who lives in draynor village. she will ask for some items and a little money. it won't exceed 5gps. for red dye.. you will need redberries and for blue dye you will need woad leaves..for yellow dye you will need onions
use yellow dye with a wig
Go to dewberry grow a yellow seed go to Mariana ask for a favor ask to manage threads ask to dye threads ask to dye strong threads yellow and you got yourself a strong yellow thread
I think you are mistaking the orange color for brown. The orange do really look like brown on normal capes. Anyways, mix red dye with yellow dye for orange dye. When you use the orange dye on a normal cape, you will get your " brown" cape.