It really depends on the melting point range.
1. Many organic substances melt below 100C so water is ideal, and not hazardous, doesn't catch fire etc
2. Clear thick paraffin oil is also good and doesn't decolourize on heating. As it can be taken to around 250C it is ideal.
3. For the third choice I'd say why not use a modern electrical melting point apparatus. The liquids are fine, but very old fashioned these days. I used to use these for all my student lab sessions as a teacher... and I retired nearly 10 years ago! So embrace modern technology!
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