One light source — the furnace mouth — is the entire look; high contrast and deep shadow do more for 'craft' than any color grade. The slow orbit keeps the glowing gather as the anchor while the hands work, so the eye never loses the hot center. Steam 'bursting on contact' is the small physical detail that makes the material feel real; keep faces out (negative prompt) so it stays about the hands.
Using & remixing it
Paste the JSON straight into Veo 3 or 3.1, or hit Copy as prose for the flattened sentence version — both work, JSON just keeps the fields easy to tweak. To change the look, re-roll one field at a time (swap the camera_motion or lighting and keep everything else fixed). Want a different subject in the same style? Open it in the Veo 3 prompt generator and edit the fields.