All items can be skipped.
Here is a forum post on how you can add these items to the loot list:
Blue Ectoplasm
Green Ectoplasm
Red Ectoplasm
Golden Idol of Tukh
You see a golden idol of Tukh that is brand-new.
It weighs 20.00 oz.
this is what exists in the monster corpse.
You see a golden idol of Tukh that has 9 minutes and 59 seconds remaining.
It weighs 20.00 oz.
this is what is in your loot backpack that you are right-clicking and adding to loot list.
these are two separate items.
adding golden tuks that are in your loot backpack is like adding a 'half-used time ring' to your loot list. No monsters drop 'half-used time rings' you need to make sure you are adding 'brand-new' versions to your skipped loot, to actually do anything.
Solution:
1) Don't loot the corpse yet
2) 'browse field' and open the corpse manually
3) add the idol of Tukh that is still in the corpse, to your loot list.