Purple it’s cool and my favorite color
The answer is C, oil. the reason being i bc they needed oil for larger scale things like oil paintings and such. hope this helps, have an amazing day :)<span />
The bottom line is that the steam wands on the espresso machine need to be cleaned after EVERY use. ... The reason that you need to clean the steam wand after each use is that the milk dries on it very quickly after the frothing process and dried milk is incredibly hard to remove once caked on.