Sodium silicate is a colorless, transparent solid or white powder soluble in water. Commercial product is often greenish or blue due to iron impurities. SiO2:Na2O ratio ranges from 1:2 to 3.75:1, with lower ratios being alkaline
Iron(II) oxide (FeO) is a black powder with formula FeO. Forms cubic rock salt structure with octahedral iron-oxygen coordination. Thermodynamically unstable below 575°C, disproportionating to Fe and Fe3O4. Can be prepared by thermal decomposition of iron(II) oxalate
Eggshell is the outer covering of hard-shelled eggs and some soft-coated eggs. Nematode eggs have two-layered structure with chitin outer layer and lipid-rich inner layer. Arthropod eggs vary in shell type: gelatinous, protein-based, or choroid membrane
Colorless, flammable organic compound with pungent alcoholic odor. Miscible in water, ethanol, and chloroform. Forms azeotrope with water, boiling point 80.37°C. Freezes at −89.5°C, becomes increasingly viscous at lower temperatures
Silicone is a polymer composed of repeating siloxane units. Typically colorless oils or rubber-like substances. Exhibits low thermal conductivity and chemical reactivity. Resistant to water, oxygen, UV light, and microorganisms
Tandem means two or more things arranged one behind another facing in same direction. Word derives from Latin "tandem" meaning at length or finally. Can refer to any group working together, not necessarily in line