i find a couple of kg san pedro cactus and decide to extract it. i read on internet that the outer green part contains mescaline. but it was very hard to seperate the green layer and the inner white layer. so i cut them together and dried the green and some white part together. is it safe to extract like that. are there any unwanted alkolloids in the white part ?

If you are doing an extraction everything but the core in the center should be useful for your purposes.

The inner core is fine too... but on old growth the woody parts are often hard to break down. If the core is soft, its fair game imo.

The white part is fine to extract and contains alkaloids, however it is often slimy and several explorers of the cacti used only the outer green part because the slime interfered with their extraction process. When isolated as a thin layer the outer green material is commonly from 1-4% mescaline by dry weight.

200 mg/foot of achuma core is what this cats ratio has been looking like (minus the wooden middle)

the skins of those feet are around 400-500 mg

Is there a fresh weight conversion?
Since Achuma can be 2-5 inches wide the measurement of the length causes some confusion.
What clone is this data for as well?

I've seen that amount from a 4 inch long section less than 3 inches wide for some pachanoi and bridgesii, or similar for a 3 foot long section of material (PC) that is 4 inches wide.

typically a foot in my book is elbow to wrist , idk man this linguistic definition escapes my comprehensive vernacular

a good foot, perhaps should be a description aswell. those cacti are trichocereus bridgesii var achuma, if i am correct, but sadly i know nothing

....drools