Should DPG/TEC Count Toward Perfume Concentration?

Hi everyone,

I’m new to perfumery and could use some advice. I have many materials that I bought pre-diluted, e.g. olibanum 50% in DPG, immortelle 10% in TEC, osmanthus 10%, etc.

If I want to make a perfume with, say, 20% concentrate, do you count the DPG/TEC as part of the 20%, or should the actual aromatic material be 20% and the diluent be excluded?

When making small test batches, I end up with a lot of DPG/TEC and very little alcohol. It feels like too much of the formula is just diluent.

Should I simply count the diluents as part of the concentrate, or is it better to buy materials undiluted? Buying everything neat would be quite expensive.

What’s the best way to handle this when working with small test batches?