Orange spots on homemade limoncello

Hi guys, maybe this isn’t a standard post but I wanted to ask someone about these orange spots.

A few months ago I decided to use the peels of my lemon trees to make limoncello, a traditional Italian alcoholic drink. The recipe is simple: the peels must be soaked in ethyl alcohol (≥95%) for about 10-40 days depending on the contact surface between the peel and the alcohol. Then filter everything and add the sugar syrup (about 300-500g per litre of alcohol, dissolved in water as needed). Finally you need to calculate how much water to add to obtain an alcohol content of around 30% Vol.

The question is that I noticed some orange spots on the surface of my limoncello and I have no idea what they are. Until now we think it could be essential oils or the color from lemons, what do you think it could be?

I have already drunk it several times (I made 4 litres) it is very good and I wasn’t bad.