According to a very trusted source of information called google, magma is hot with a temperature of 1500 celsius or 2700 degrees fahrenheit while the household fire is about 600 celsius or 1100 fahrenheit while plasma being the extreme of both in temperature
This begs me to question why magma isnt able to ignite poison but instead clears them when fire that has lower temperature than magma, is able to ignite poison but magma cant?