The best replacement for koh is naoh.

The best alternatives to koh are rated as following:
★★★★★  naoh
★★  naoh biodiesel
★  wet prep
★  wet mount
★  ko
  lim
  tmah
  hcl
  aqueous koh

Your alternative for koh is not listed? Suggest!
Speaking about koh, one probably shouldn't forget about h2so4.

Other search terms related to koh and their ratings are:
★★★★★ h2so4
★★★★ hno3
★★ khp
★★ calcofluor white
h3po4
You have in mind a companion for koh and it is not yet here? Propose!



Google Trends

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koh
naoh
naoh biodiesel