wire brush and a heat gun might be sufficient but i belive the chemical you're looking for is dichloromethane, which was banned by the EU as it's remarkably bad for your health (https://premiumdoorstripping.co.uk/dangers-dichloromethane-paint-strippers/)
https://www.toolstation.com/paint-panther-paint-varnish-remover/p15403
That stuff looks well reviewed, and a little less deadly
Heat gun was useless, the black paint came off by scrapping. Paint stripper got off the white layer but the terracotta floor paint is firmly attached and impervious to sanding, scrapping and heat .
@user67680 started
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wire brush and a heat gun might be sufficient but i belive the chemical you're looking for is dichloromethane, which was banned by the EU as it's remarkably bad for your health (https://premiumdoorstripping.co.uk/dangers-dichloromethane-paint-strippers/)
https://www.toolstation.com/paint-panther-paint-varnish-remover/p15403
That stuff looks well reviewed, and a little less deadly