Metallic Substance? What is it? Will it wear off?

I bought Phytospecific Phytorelaxer #1.  I have short wavy-to-curly hair.  Brown, Fine/Thin, but strong.  I wanted to use the relaxer BUT I read that is should not be used on hair that was colored with Metallic Substances.  2 Months ago I colored my Hair with Loreal Feria #36 Cherry Chocolate.  How do I know if this had Metallic Substances?  AND if it does.... then how long do I have to wait b4 i can use the relaxer.... or did I just lose $60.00?  because I did not do my homework.  I would rather lose $60 dollars than a head of hair...... even if it is only the length of a grown out pixie cut. Please send your thoughts.  Thx.