Research paused during World War II, and it was not until the 1950s that powder diffraction analysis revealed the Maya blue pigment had been made by mixing clay, palygorskite (a rare fibrous clay ...

23 x 11 x 10 cm. (9.1 x 4.3 x 3.9 in.) ...

If your garden has clay soil, particularly heavy clay soil, you may feel that you have limited options for growing plants. Clay soil can be sticky, hard to work and is easily compacted. But it’s also ...