Any body knows that why my aqua solution of sodium sulfide became green???

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Federico Svarc

Do you use p.a. drugs?

If it is a comercial quality, you have some contamination. Maybe Cu or Cr cations

Maryam bagheri Varzaneh

I had a similar experience and I don't know why. The solution did not smell like eggs at all, but when it was mixed with other components of the buffer, sulfured smelled.