Gotcha. I have tags prelabelled that I tie to my jugs to indicate mixed or unmixed as well.
Clear jugs are nice too for a visual reminder but some oils like the Seadoo mineral oil is honey colored and doesn't change the color enough.
Been through that.. My builder recommended I break in an engine with Seadoo mineral oil. Great stuff but impossible to tell if it's mixed or not. Really have to make use of tags/labels using it.