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Both NaOH and KOH absorb water from the atmosphere (KOH pellets can turn into a caustic puddle pretty quickly on a humid day). There are two reasons I bring this up:1) this will make it slightly more complicated to get the proportions right, since some of the mass of each component is an unknown amount of water. I don't know how sensitive the melting point is to the proportions of the mixture...2) when you start heating, the water will boil off--potentially spattering or splashing hot alkali. In addition to whatever eye/face shield and gloves you will be using, I recommend having a shield or screen you can put around the crucible as it is heated, or at least between you and it.good luck!