For the flame test, all alkali metals burn in presence of oxygen to form oxides and sometimes form peroxides in excess oxygen. They burn with different characteristic colours. 4Li + O2 = 2Li2O Red flame 4Na + O2 = 2Na2O Yellow-orange flame 4K + O2 = 2K2O Purple flame For the ammoni...
Figure 3. Usage frequency of the top 3 skin repair ingredients in cosmetics extended: metal salts and oxides (blue), vitamin E and derivatives (orange) and C. asiatica and pure compounds (yellow). 2.1.2. Topical Medicines From the analysis of labels and summary of products characteristics ...