Particles of iron oxide and iron in the soil, perhaps also on the stalk, spikes and grains: cathodic reduction and pyrolysis, the particles could be partially melted.
Particle ng bakal oksido at bakal sa lupa, din Marahil sa unti-unting lumaganap, spike at butil: cathodic pagbabawas at pyrolysis, ang mga particle ma bahagyang tinunaw.