Bag of coal

[Vidshooter]

I've recently bought 4 locos which came with little bags of what looks like coal.
The preformed coal in the tender of the HO Shay looks realistic enough, so I m wondering what little bag is for.
Is it to sprinkle over the pre-formed?  Or to make a totally different, more realistic load?

(Sorry if this is a dumb question).

Regards,
Erik

[ABC]

It is optional, just for a different look, you can use it as you see fit. Use a water-glue mixture to get it to stay.

[the Bach-man]

Dear Erik,
It simulates cinders for superdetailing your loco.
Have fun!
the Bach-man

[Woody Elmore]

You mean you shouldn't eat it?

[Doneldon]

Woody -

No! Of course you shouldn't eat it.  But it makes a delicious tea.

                                                              -- D

[Woody Elmore]

Or topping on ice cream.