Thanks a lot for your comments.
Waow!!! The goodscentscompany has everything! From cardamom absolute, liquid resin, CO2 extract, oleoresin, to cardamom seed oil. The only thing is that - and you will find me very stupid - they don't have an online store or what??? Eden Botanicals is more practical. But not cheap, hmmm...
About the tincture, I am looking for perfume purpose, not culinary. Yes, I've made tincture before, with vodka not ethanol, a vanilla one (actually, mumsy, if you are talking about the tincture recipe in the “vanilla absolute” in the DIY section, it comes from me...). I’ve made 2 vanilla tinctures, actually: one with whole pods and one with crushed pods. The tincture with the whole pods is clear but the other one with grinded pods is opaque. Plus, I’ve noticed some bubbles, even dried, the pods contained water... I’ve tried to filter it with a coffee filter, it didn’t work. So, I had to literally filter with a tea mesh strainer, then, refilter in a coffee filter, but not super great results regarding to the aspect that is an opaque liquid (but the bubbles are gone and the scent is a fantastic Bourbon vanilla smell though). Anyone knows how to make it transparent? I am wondering what will happen with grinded cardamom (thanks for the proportions, gido, I was looking for the ratio actually. Yeah, I’ll have to go to an Indian grocery to buy lots of cardamom seeds…). I am gonna experiment as soon as I get bunch of cardamom pods and will let you know about the results...