What I'd like to ask the forum is, will kilning cause the green spots to disappear?
If the question is about whether the
color will disappear in the kiln, the answer is somewhat or maybe completely. BUT...as the others have observed, those portions of the leaf will never be as smooth/flavorful/inviting as it would have been, had it not dried green.
When leaf is yellowing, it is still alive. As it yellows, it simultaneously metabolizes and eliminates certain carbohydrates and albuminous proteins. The fact that the leaf is yellowing while it is also breaking down these compounds
is entirely a coincidence. (White stem burleys yellow very rapidly, but the other chemical processes are as slow as in other varieties.)
Key to understanding flash-green leaf is that once the leaf desiccates, it dies, so no more metabolic changes. With most varieties, once the leaf has fully yellowed, you can then allow it to dry as rapidly as you can manage, and it will go on to turn brown. I discourage that approach with white stem burley varieties, since the color change is not synchronized.
If just the underside of a very dark leaf appears greenish, that will usually resolve favorably with kilning, and is common with dark maduro and oscuro leaf.
Kilning, or even just exposing the flash-green dried leaf to direct sunshine, will slowly breakdown that stubborn chlorophyll. But only a great deal of aging has any chance of minimizing the leftover carbs and proteins.
Sorry. I got wordy.
Bob