Clear flux is also used to make opaque enamels; the addition of calx, a mixture of tin and lead calcined, renders translucent enamels opaque.
"Now I can make opaque layers that set off the clear, bright-colored ones".
The water in the Morris tank was not made opaque because the gray escape platform in the gray tank is virtually invisible to swimming rats.
The apparatus consisted of a large circular pool, approximately 1.0 meter in diameter, containing water, at around 25°C, that was made opaque by the addition of milk to help hide the submerged platform.
The water was maintained at 25 ± 1°C, made opaque by the addition of 200 ml of latex solution, and changed daily using an automatic filling and draining system.
The pool was filled with water maintained at 20°C and made opaque by the addition of a non-toxic white cosmetic adjuvant.
Essentially it is lead glaze made opaque by the addition of tin oxide; tin glaze was no doubt originally devised to conceal flaws of colour in a fired-clay body.
The pool was filled with water (depth: 30 cm) maintained at 20°C, which was made opaque by the addition of a nontoxic white paint.
The pool was filled to a depth of 20 cm with water (24° 25°C) that was made opaque by the addition of non-toxic white paint.
Firstly, our novel optics cut off incoming light selectively without themselves going out of focus, so virtual objects that should be in front of the real scene are made opaque and sharply occlude the background.
