Simple starter overflow question

[Kaotica]

Made a 2L starter for Edinburgh Ale Yeast for a Strong Scottish Ale and it worked (really) well. Just curious since I have never had a starter go so strongly, is the tan goo from the overflow yeast or some kind of waste? This one spilled over three time like this.

 

[TheJasonT]

Try to acquire some FermCap. It's a silicone based liquid that breaks up surface tension to prevent foam overs. I use 2 drops in the starter boil, 2 in the starter itself, 8-16 in the full boil, and 8ish in the fermenter.