root beer foam

Ingredients
1

Anybody know if there’s a certain ingredient used to get that long-lasting rocky, foamy head in a root beer?  I keg-carbed my 1st root beer attempt.  Wondering if bottle-conditioning it would work better (obviously in a plastic 2L)  It tasted great, but the head had no retention.

I steeped 6 oz of rolled oats hoping to give it a thick, creamy mouthfeel and that would help the head.  Score: zero for zero.

Any thoughts?

2

There are additives to increase head retention and I think you can get them at homebrew shops. I was at a local brewery that makes a root beer and they had containers of ‘concentrated foam’ for the rootbeer. Look for ‘heading agents’.

3

maltodextrin will add some body and head retention to your sodas.  Try using 8g or so per liter.