Personalised pens are one of the most effective, practical, and long-lasting promotional gifts for promoting a brand. However, when it comes time to choose the ideal features for this writing accessory, a common question arises: should I opt for blue or black ink pens? Although it may seem like a minor detail, the ink colour plays a relevant role depending on the use, the symbolism associated with it, and cultural preferences.

In this article, we will explore the origins of this difference, the ideal contexts for each ink colour, and how this choice can influence the perception of your promotional gifts.

A Brief Historical Overview

The choice between blue or black ink dates back to early 20th-century practices. Blue ink was widely used to distinguish original documents from copies, which typically appeared black due to the use of carbon paper. Additionally, blue ink had the advantage of being easier to remove in case of accidents.

On the other hand, during World War II, black ink gained prominence. Soldiers used black pens to reduce the weight of postal mail, as letters were photographed and reproduced at their destination with greater clarity.

These historical practices helped solidify the use of both colours in distinct contexts, but both continue to coexist in the modern world.

Official Signatures: Blue or Black?

In Portugal, there is no strict rule about the ink colour used in official documents. Both blue and black ink are accepted. However, there are a few nuances that can help in making the decision:

• Blue Ink: It is often recommended for signatures on important documents, as it clearly distinguishes the original from the copies, preventing confusion.

• Black Ink: It gives a more sober, formal, and “exclusive” tone to the signature. It is also preferred in processes that require digitisation, as it provides better clarity and quality.

In many countries, such as the UK, Colombia, and China, blue ink (in indigo tone) is required for documents, precisely to prevent fraud. If you work with international clients or partners, this detail can be crucial.

Practical Summary:

• Want to highlight the authenticity of a document? Choose blue ink.

• Going to digitise the document or add a touch of formality? Black ink is the best option.

Did you know blue ink can help with memory?

Did you know that blue ink can help improve memory? Many students prefer blue ink pens not only for aesthetic reasons but also for their psychological effects.