Okay, so I answered my own question! I found
this explanation of drying oils on Ktani's Hair Sense blog. She taught me that the drying capacity of an oil is determined by its iodine value, and linked me to
this page where you can see the iodine values (and various other properties) of a long list of oils.
According to Ktani,
"If an oil has an iodine value of 130-190 or higher, it is a drying oil." I found out that there are certainly a few oils on the list in the OP that are lower than this. (Based on what I found, I think I'm going to look into getting cottonseed, sesame, and/or rice bran oil.)
So for your geeky pleasure, here are all the oils listed in this thread to be 20% or higher in ceramides, and their iodine values! Those lower than 130 are in green, those higher are in red.
Oil Name --- Iodine - Ceramides
pistachio ----- 95 --- 33%
cottonseed -- 108 --- 54%
sesame ----- 110 --- 45%
rice bran ---- 110 --- 39%
canola ------ 110 --- 21%
corn -------- 117 --- 59%
wheat germ - 128 --- 55%
Grapeseed -- 131 --- 73%
soybean ---- 131 --- 51%
sunflower --- 133 --- 68%
poppyseed -- 140 --- 70%
Safflower --- 145 --- 78%
walnut ------ 145 --- 51%
hemp ------- 165 --- 60%
Note that there are a few alternative versions of some of these oils listed at lower iodine values. I don't know how their being altered might affect the level of ceramides in them though. These are:
27.5% hydrogenated soybean oil - I.V. 78
High oleic sunflower oil - I.V. 83
High oleic safflower oil - I.V. 93
High oleic canola oil - I.V. 96
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