It changes into a yellow powder when exposed to light.

At room temperature and pressure it is a greenish yellow powder.

The student body felt that the previous colors of powder blue and yellow were no longer fashionable for athletic team uniforms.

Tom yelled, still swiping at the yellow powder that covered his body.

The bottle was filled with a dirty yellow powder.

The first officer turned to his right and saw an open jar filled with a yellow powder.

In its natural form it is a whitish or pale yellow colored powder.

It is a yellow powder, soluble in hot water.

Both have smears of red and yellow powder on the glass over their foreheads.

It has the appearance of a slightly yellow powder.