ink是不是可數名詞?

例句：

These ink stains won't wash out.

這些墨漬洗不掉。

The ink had faded to invisibility.

墨水已退色看不見了。

The letter was handwritten in black ink.

這封信是用黑墨水手寫的`。

The message was written in indelible ink.

這條資訊是用不褪色的墨水寫的。

These ink stains won't come out of my dress.

我衣服上的這些墨水斑點洗不掉。