Learn Farsi: برای به دست آوردن این طیف، فقط به رنگ پایه نیاز داری. - To obtain this shade, you only need the base color.

When expressing purpose with the preposition برای (for), Farsi often uses the infinitive. This translates perfectly to 'for obtaining' or 'in order to obtain'. While you could use a subjunctive clause like برای اینکه به دست بیاوری, the infinitive is more natural and concise here.

Why is there an Ezafe after the infinitive به دست آوردن?

Because infinitives in Farsi function as verbal nouns, they link to their objects using the Ezafe. You pronounce this connection as 'be dast avardan-e in teyf', which literally behaves like 'the obtaining OF this shade'.

The word طیف usually translates to 'spectrum'. How does it mean 'shade' in this sentence?

While طیف strictly means 'spectrum' or 'range', in contexts like painting, cosmetics, or lighting, native speakers frequently use it to refer to a specific hue, tone, or shade within that color spectrum.

Why do we need the preposition به right before رنگ پایه (base color)?

The compound verb نیاز داشتن (to need) always requires the preposition به to connect to its object. In Farsi, the literal structure is that you 'have a need TO something', so you cannot drop the به.