When considering whether to use 20 or 30 developer for your hair coloring needs, what factors should you weigh? Is it not crucial to comprehend the distinctions in terms of lift and processing time? For instance, while 20 developer typically offers a subtle enhancement of the natural pigment, is it sufficient for your desired result? On the other hand, wouldn’t a 30 developer provide a more pronounced lift, effectively lightening the hair by several levels? However, is there not a trade-off in terms of potential damage to the hair structure? Could it be that the higher the developer’s volume, the greater the risk of compromising the integrity of your strands? Moreover, how do different hair types and existing color affect your decision? Are porosity and texture significant in determining the optimal choice? What happens if you mix them, or use one on a whim? Wouldn’t it be prudent to deliberate carefully before proceeding?