First of all as a newbe want to say hallo to everyone.
During E6 process I by mistake polluted developer with stabilizer, and have now ugly green Dmax on Ektachrome. Is it posoble to make it black again (maybe some other bath) or I can throw it away?
Welcome! I am not sure of the answer to your question, but it seems unlikely you can remedy the error now because the issue relates to the developer phase. Just my 2 cents, but not that informed.