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Sources:
https://organichaircolorreview.wordpress.com/2013/01/03/mea/
https://www.combededucation.com/post/ammonia-vs-mea-what-s-the-difference
https://iris.epa.gov/static/pdfs/0422_summary.pdf
https://www.ncbi.nlm.nih.gov/books/NBK598714/
https://www.safecosmetics.org/chemicals/resorcinol/
https://www.safecosmetics.org/chemicals/p-phenylenediamine/
By Casey TaylorSources:
https://organichaircolorreview.wordpress.com/2013/01/03/mea/
https://www.combededucation.com/post/ammonia-vs-mea-what-s-the-difference
https://iris.epa.gov/static/pdfs/0422_summary.pdf
https://www.ncbi.nlm.nih.gov/books/NBK598714/
https://www.safecosmetics.org/chemicals/resorcinol/
https://www.safecosmetics.org/chemicals/p-phenylenediamine/