Yes, they are - you will be safe. :)
No, a lump of coal is opaque and non-white.
The cast of Victorias Story - 2013 includes: Kerryann White as Victoria Robertson
Gluesticks are an opaque white.
Then, your diamond looks opaque white under a black light.
No, any color may be opaque, even white. Opaque is simply the quality of not being transparent or translucent.
An opaque white
Watercolor that has been made opaque by adding inert white pigment to it is called "gouache".
White light is all the colors of light. Which are magenta,yellow,and cyan being the main three colors that are reflected by an opaque white object
Selecting Opaque specifies that the existing picture will be covered by the white background of a selected area in Paint.
I think it would be opaque.
Black and white - no transparency.
Google has many images of those swimsuits, try to enter keystone swimsuits or Charlie Chaplin. The old black and white movies should give you a glimpse of that time.