The song is technically in E standard, but Iommi often used light strings and slightly loose tuning for his signature heavy feel.
The "slide" is the most important stylistic element. Don't just jump between positions; let the strings "zip" to connect the chords. iron man tab
Use a touch of reverb, but keep it "dry" to maintain the riff’s punchy clarity. Pro Tips for Success The song is technically in E standard, but
Use your bridge pickup with volume and tone set to 10. iron man tab