Brother GTX600NB Instruction Manual page 173

(3) Hold the ink bottle upside down and apply lighting to its side face to visually check sediments.
A dark shadow is seen on the bottom if sediments are remaining, so repeat steps (1) and (2) until such a dark
shadow disappears.
<TIPS>

Use bright lighting and darken the surrounding area to make the sediments more visible.
White ink
Sediments
Agitated state
<TIPS>

The shadows of bubbles may be confusing with sediments after the white ink agitation, so leave the bottle until bubbles
disappear before checking for sediments.
To distinguish between bubbles and sediments, lightly shake the ink bottle. The shadows of bubbles move, but the shadows of
sediments do not move.
Precautions to keep good printing quality/use printer over the long term
With sediments
Sediments
Sediments
Upside
down
6-5
Apply lighting
sideways
Without sediments
Bubbles
White ink
X1037
X1045