Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: First Term
Week: 9
Age: 15 years
Duration: 45 minutes
Subject: Dying and Bleaching
Curriculum Theme: Trade
Previous Lesson: Tie and Dye Practical: Producing Tie and Dye Fabric.
Topic: INTRODUCTION TO PLAIN DYING OF FABRIC
Subject Matter: meaning of plain dyeing, cotton material absorbency of dye, reactive dyes and suitable materials, difference between tie dyeing and plain dyeing, preparing materials for plain dyeing

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define plain dyeing.
Explain why cotton materials absorb dye well.
Identify reactive dyes and list suitable materials for them.
Differentiate between tie dyeing and plain dyeing.

Affective Domain:

Appreciate the importance of proper material preparation for plain dyeing.
Show interest in learning different dyeing techniques.

Psychomotor Domain:

Outline the steps for preparing materials for plain dyeing.

Participate actively in discussions about dyeing techniques.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum.
State Unified Scheme of Work.
Introductory Technology for Senior Secondary Schools, Book 1.

Instructional Materials

The teacher will teach this lesson with the aid of:

Cotton fabric samples.
Reactive dye samples.
Bowls or basins.
Stirring spoons.
Water source.
Gloves and apron.

Rationale for the Lesson

This lesson helps pupils understand a fundamental fabric decoration technique used in the textile industry. Learning about plain dyeing enables pupils to appreciate how fabrics get their colours and provides a foundation for practical skills in textile design.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of different types of fabrics and some understanding of how colours are applied to materials.

Lesson Content/Board Summary

INTRODUCTION TO PLAIN DYING OF FABRIC

Meaning of Plain Dyeing

Plain dyeing is a fabric dyeing technique where a fabric is immersed evenly in a dye bath to achieve a uniform colour throughout the entire material. It results in a solid, single-coloured fabric without patterns.

Cotton Material: Absorbency of Dye

Cotton is a natural cellulose fibre known for its excellent absorbency. This characteristic makes cotton materials highly suitable for dyeing, as they readily take up and retain dye colours, resulting in vibrant and lasting results.

Reactive Dyes and Suitable Materials

Reactive dyes are a class of synthetic organic dyes that chemically react with the fibre molecules to form a covalent bond. This bond makes the dye part of the fibre, giving the fabric excellent wash fastness and bright colours.

The following are suitable materials for reactive dyes:

Cotton
Linen
Rayon
Hemp
Other cellulose fibres

Difference between Tie Dyeing and Plain Dyeing

The main differences between tie dyeing and plain dyeing are:

Plain Dyeing: Aims for a uniform, single colour across the entire fabric. The fabric is evenly submerged in the dye bath.
Tie Dyeing: Involves folding, twisting, pleating, or crumpling fabric and binding it with string or rubber bands before dyeing. This creates un-dyed areas, resulting in patterns and designs.

Preparing Materials for Plain Dyeing

Proper preparation of materials is important for successful plain dyeing. This process helps the dye absorb evenly and prevents blotches or uneven colouring.

The following are steps for preparing materials for plain dyeing:

Washing: Wash the fabric to remove any dirt, oils, starches, or finishes that might prevent dye absorption.
Rinsing: Rinse the fabric thoroughly to remove all soap residue.
Wetting Out: Ensure the fabric is completely wet before introducing it to the dye bath. This helps the dye penetrate evenly.
Weighting: For accurate dye measurement, the dry weight of the fabric is often needed.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and introduces the topic by asking them to identify different coloured fabrics they are wearing. The teacher then asks how they think these fabrics got their colours, leading to the concept of dyeing.
Pupils’ Activity: Pupils respond to the questions and share their ideas about how fabrics are coloured.
Learning Point: Pupils are engaged and introduced to the concept of fabric colouring.

Step 2: Meaning of Plain Dyeing

Time: 5 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines plain dyeing, explaining that it is a process where a fabric is coloured uniformly. The teacher may show a plain dyed fabric sample.
Pupils’ Activity: Pupils listen attentively and write down the definition in their notes.
Learning Point: Pupils understand the meaning of plain dyeing.

Step 3: Cotton Material and Reactive Dyes

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains why cotton materials are good for dyeing due to their absorbency. The teacher then introduces reactive dyes, explaining what they are and listing materials suitable for them. The teacher can show samples of cotton fabric and explain how reactive dyes work on them.
Pupils’ Activity: Pupils listen, observe the samples, ask questions, and take notes.
Learning Point: Pupils learn about the absorbency of cotton and the properties and suitable materials for reactive dyes.

Step 4: Difference between Tie Dyeing and Plain Dyeing

Time: 10 minutes
Teaching Skill: Comparison/Discussion
Teacher’s Activity: The teacher explains the key differences between plain dyeing and tie dyeing, emphasizing the uniform colour of plain dyeing versus the patterned effect of tie dyeing. The teacher may show examples of both.
Pupils’ Activity: Pupils participate in the discussion, compare the two techniques, and note down the differences.
Learning Point: Pupils can differentiate between plain dyeing and tie dyeing.

Step 5: Preparing Materials for Plain Dyeing

Time: 5 minutes
Teaching Skill: Practical Guidance/Demonstration
Teacher’s Activity: The teacher outlines the steps for preparing materials for plain dyeing, such as washing, rinsing, and wetting out. If possible, the teacher demonstrates the initial steps using a small fabric sample.
Pupils’ Activity: Pupils observe the demonstration, ask questions, and discuss the importance of each preparation step.
Learning Point: Pupils understand the steps involved in preparing fabrics for plain dyeing.

Step 6: Class Activity/Recap

Time: 5 minutes
Teaching Skill: Review/Consolidation
Teacher’s Activity: The teacher asks pupils to briefly summarise what they have learned about plain dyeing, cotton absorbency, and the difference from tie dyeing.
Pupils’ Activity: Pupils volunteer to summarise the key points of the lesson.
Learning Point: Pupils consolidate their understanding of the lesson content.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define plain dyeing.
State two reasons why cotton is suitable for dyeing.
Mention two materials suitable for reactive dyes.
List two differences between tie dyeing and plain dyeing.
Outline two steps involved in preparing materials for plain dyeing.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarises the lesson by reiterating the main points on plain dyeing and its importance. The teacher assigns homework, asking pupils to find out about other types of dyes.
Pupils’ Activity: Pupils listen to the summary and note down the homework.
Learning Point: Pupils have a clear understanding of the lesson and are prepared for future topics.

Lesson Keywords

Plain Dyeing – A method of colouring fabric uniformly with a single colour.
Absorbency – The ability of a material to take in liquid, like dye.
Reactive Dyes – Dyes that chemically bond with fabric fibres, producing permanent colours.
Tie Dyeing – A dyeing method that creates patterns by binding fabric before dyeing.
Wetting Out – The process of thoroughly soaking fabric in water before dyeing.

Differentiation

For pupils who grasp concepts quickly, the teacher can encourage them to research different types of dyes and their applications. For pupils who need more support, the teacher can provide simplified notes and use more visual aids, allowing them to focus on defining key terms and identifying basic differences.

Note for teachers using this lesson plan

Encourage practical demonstrations where possible, even if on a small scale, to help pupils visualise the process. Emphasise safety measures when handling dyes and chemicals, such as wearing gloves and aprons. Ensure pupils have enough time to ask questions and clarify doubts.