اللون ده احمر.

A common Egyptian pronunciation is il-lōn da aḥmar.

A rough English-style guide is il-LOHN da AH-mar.

Two useful notes:

• اللون is usually pronounced il-lōn / el-lōn
• ح in احمر is a deeper, throatier sound than ordinary English h

That is partly because of Egyptian pronunciation and partly because of the spelling pattern.

In Egyptian Arabic:

• ال is often pronounced il / el
• the ل in اللون is pronounced as a doubled l
• the vowel in لون is commonly heard as ō, so you get il-lōn

So a learner will often hear something much closer to il-lōn than the more Standard Arabic-style al-lawn.

In Egyptian Arabic, demonstratives like ده usually come after the noun.

So:

• اللون ده = this color
• literally, it looks like the color this

This is very normal in Egyptian Arabic, even though it feels backwards from English.

Because in Egyptian Arabic, a noun followed by ده / دي / دول is normally treated as definite.

So you usually say:

• اللون ده = this color
• البنت دي = this girl
• الكتب دي = these books

Using ده without ال on the noun is usually not natural here.

Here, ده means this and it is the masculine singular form.

Other common forms are:

• دي = this, feminine singular
• دول = these

Since لون is a masculine singular noun, ده is the right form.

Because in Arabic, including Egyptian Arabic, the verb to be is usually omitted in the present tense.

So:

• اللون ده احمر literally looks like this color red
• but it naturally means this color is red

This kind of sentence is very common in Arabic.

Because احمر is the predicate adjective here, not an adjective directly attached to the noun.

Compare these:

• اللون ده احمر = this color is red
• اللون الأحمر = the red color

In the first sentence, احمر tells you something about اللون ده, so it stays indefinite. In the second, الأحمر is part of the noun phrase itself, so it takes ال.

Because the adjective agrees with اللون, and لون is masculine.

So:

• masculine: احمر
• feminine: حمرا

For example:

• العربية دي حمرا = this car is red

Even if the thing being talked about somewhere else is feminine, in this sentence the adjective is agreeing with اللون, not with some other hidden noun.

Sometimes, but changing the order can change the meaning.

Compare:

• اللون ده احمر = this color is red
• ده لون احمر = this is a red color / this is a red one
• اللون الأحمر = the red color

So the original sentence is the natural way to say this color is red.

In careful spelling, the word is usually written أحمر with a hamza.

In informal Egyptian writing, especially in texting or casual online writing, people often leave hamzas out, so احمر is very common.

So:

• أحمر = more careful spelling
• احمر = very common informal spelling

You can add مش before the adjective:

اللون ده مش احمر

That is the normal Egyptian way to negate this kind of sentence.