How can I change my fire color after I create it?

I am making fire when I touch a part but I can't tell how to change the color of it.

local PlayersService = game:GetService("Players")

local debounce = false

script.Parent.Touched:Connect(function (hit)
    if hit and hit.Parent:FindFirstChild("Humanoid") and PlayersService:GetPlayerFromCharacter(hit.Parent) and debounce == false then
        local fire = Instance.new("Fire")
        fire.Parent = script.Parent
        debounce = true
        wait(1)
        debounce = false
    end
end)