opaque

adjective/əʊˈpeɪk/CEFR B2

অস্বচ্ছ, ভেতর দেখা যায় না এমন

Meaning

Not able to be seen through.

Synonyms: cloudy, solid

Antonyms: transparent

transparent
স্বচ্ছ, ভেতর দেখা যায় এমন
Clear enough to see through.
translucent
আধা-স্বচ্ছ, আলো ভেদ করে এমন
Allowing light through but not fully clear.
translucent shade
স্বচ্ছাভ রং, আলো ভেদ করা হালকা রং
A colour that lets some light pass through it.
see-through
ভেতরটা দেখা যায় এমন, স্বচ্ছ
Thin or clear enough to see through, especially of cloth.
semi-transparent
আধা-স্বচ্ছ
Letting some light through, so shapes behind are blurred.

It is watercolour with white pigment added, which makes it opaque — so a light colour can be laid over a dark one, which ordinary watercolour cannot do. It also dries lighter than it looks while wet, and painters allow for that rather than being surprised by it every time.
gouache — dictionary →
Jasper is opaque, and that is exactly what separates it from its relatives — carnelian, agate and bloodstone are all chalcedony too, but they let light through where jasper stops it dead.
jasper — dictionary →

adjective/əʊˈpeɪk/CEFR B2

অস্বচ্ছ, ভেতর দেখা যায় না এমন

Not able to be seen through.

Synonyms: cloudy, solid

Antonyms: transparent

transparent
স্বচ্ছ, ভেতর দেখা যায় এমন
Clear enough to see through.
translucent
আধা-স্বচ্ছ, আলো ভেদ করে এমন
Allowing light through but not fully clear.
translucent shade
স্বচ্ছাভ রং, আলো ভেদ করা হালকা রং
A colour that lets some light pass through it.
see-through
ভেতরটা দেখা যায় এমন, স্বচ্ছ
Thin or clear enough to see through, especially of cloth.
semi-transparent
আধা-স্বচ্ছ
Letting some light through, so shapes behind are blurred.

It is watercolour with white pigment added, which makes it opaque — so a light colour can be laid over a dark one, which ordinary watercolour cannot do. It also dries lighter than it looks while wet, and painters allow for that rather than being surprised by it every time.
gouache — dictionary →
Jasper is opaque, and that is exactly what separates it from its relatives — carnelian, agate and bloodstone are all chalcedony too, but they let light through where jasper stops it dead.
jasper — dictionary →