Green, purple and red pens for schools: marking and self-assessment explained

Why do schools use different coloured pens?

Colour-coded marking systems help pupils understand feedback, take ownership of improvements and make progress visible over time. While green, purple and red pens each serve different purposes, the real value lies in creating a consistent approach that helps pupils engage actively with learning rather than simply receiving feedback.

Open a pupil's exercise book in most UK primary schools and you will often see a mixture of colours across the page.

• Black handwriting records the original learning.
• Green comments highlight opportunities for improvement.
• Purple responses show where pupils have reflected, edited or improved their work.
• Red markings may indicate checking, assessment or teacher feedback.

To an outsider, these colours might look like a stationery choice. To teachers, they represent something far more important. They show the ongoing dialogue between teaching and learning.

Over the past decade, many schools have moved away from marking systems focused solely on identifying mistakes and towards approaches that encourage pupils to actively respond to feedback. The colour of the pen matters far less than what happens after the feedback is given.

Colour-coded systems provide clarity. They help pupils quickly identify:

• What they originally wrote
• What feedback was provided
• Where improvements have been made
• How their work has developed over time

This becomes particularly important in primary schools where children are still learning how to reflect on their own work.

Hope Education's curriculum specialists regularly see schools using colour-coded approaches not because inspectors expect them, but because they help pupils understand the learning process more clearly. When children can physically see the difference between their first attempt and their improved response, progress becomes more tangible.

Research from the Education Endowment Foundation consistently highlights the importance of feedback that requires an active response from pupils rather than passive acknowledgement.

What are red pens used for in primary schools?

For many years, red pens were the default marking tool in UK classrooms. Today, their role varies between schools, but they are still commonly used for:

• Teacher assessment
• Checking accuracy
• Summative comments
• Arithmetic marking
• End-of-unit reviews

One interesting pattern GLS often sees when working with schools is that red pens are frequently overestimated during stationery forecasting. Because teachers use them regularly, many schools assume they will be the highest-volume feedback colour.

In reality, pupil-response colours often require significantly larger stock allocations throughout the year. Understanding how resources are actually used is often more valuable than relying on assumptions about consumption.

What does green for Growth mean?

Green for Growth has become one of the most widely recognised formative assessment approaches in primary education. Rather than focusing solely on what needs correcting, green feedback highlights opportunities for development.

Teachers often use green pens to:

• Identify next steps
• Highlight success criteria
• Guide editing
• Support self-assessment
• Encourage reflection

The philosophy behind Green for Growth is simple: learning should not stop once the work is completed. Instead, feedback becomes a bridge between current understanding and future improvement.

Schools often find that green pens become heavily used because they support both teacher-led feedback and pupil-led reflection activities. As a result, consumption frequently exceeds expectations, particularly when green becomes embedded across multiple curriculum areas.

What is the purple pen of Progress?

Few classroom strategies have become as recognisable as the Purple Pen of Progress. Used during DIRT (Dedicated Improvement and Reflection Time), purple pens allow pupils to visibly respond to feedback and improve their work.

The approach has become popular because it shifts the focus from what the teacher writes to what the pupil does next. Pupils may use purple pens to:

• Improve writing
• Correct misconceptions
• Refine answers
• Respond to questions
• Reflect on previous learning

The purple colour simply makes this process visible. The real value comes from the thinking that takes place behind it. Many school leaders find that purple pen activities provide some of the clearest evidence of pupil engagement with feedback because the learning journey can be seen directly on the page.

Why do schools run out of purple pens first?

This is one of the most common surprises for School Business Managers. Purple pens are often assumed to be a specialist item used occasionally. The reality is very different.

While a school may have a relatively small number of teachers using red or green marking pens, hundreds of pupils may be using purple pens every week. Across schools supplied by GLS, purple pens frequently become one of the highest-volume feedback consumables in the building.

This is why many schools move away from mixed packs and towards single-colour ordering. When purchasing reflects actual classroom behaviour, stock management becomes significantly easier.

Should schools buy mixed packs or single-colour packs?

The answer depends on the school's marking policy. Mixed packs can be useful where colours are used equally. However, many schools discover that their feedback system creates highly uneven demand.

Purple pens may disappear rapidly. Green stock may need regular replenishment. Other colours remain largely untouched.

This is one reason the Classmates range from GLS includes single-colour pen packs designed specifically for schools operating structured feedback systems. Rather than forcing schools to buy colours they do not need, stock levels can be aligned more closely with actual classroom usage. For School Business Managers, that often means fewer emergency orders and less wasted stock.

Why does consistency matter more than colour choice?

One of the most valuable lessons schools learn is that successful marking systems are rarely the most complicated. They are the most consistent.

When pupils encounter the same approach across classrooms and year groups, they spend less time learning the system and more time engaging with feedback. Likewise, when schools standardise colours and routines, procurement becomes simpler, forecasting becomes more accurate and resources can be shared more easily.

At Findel, we see this principle repeated across education. Whether schools are implementing a feedback policy, reviewing classroom resources or planning curriculum investment, consistency often creates confidence. The strongest systems are usually those that work equally well for pupils, teachers and the staff responsible for supporting them.

Supporting feedback systems that work in practice

Feedback is one of the most powerful tools available to teachers. However, effective feedback depends on more than policy documents. It requires routines, resources and consistency.

Hope Education works closely with schools developing teaching and learning approaches that help pupils become more reflective and independent learners. Alongside this, GLS supports schools with the practical classroom resources needed to implement those approaches consistently across every year group.

Together, they provide something more valuable than pens alone. They help schools build feedback systems that are sustainable, visible and meaningful for the pupils who use them every day.