Bece Model Questions Vol1 2024 Cultural And Creative Arts Question 5

Practice practical question 5 from the 2024 Bece Model Questions Vol1 Cultural And Creative Arts examination. This question covers Colour Theory, Subtractive colour mixing, Colour matching, Experimental procedure .

Bece Model Questions Vol1 2024 Cultural And Creative Arts Practical

Topics: Colour Theory Subtractive colour mixing Colour matching Experimental procedure

Question 5 BECE_MODEL_QUESTIONS_VOL1 • 2024 • CULTURAL_AND_CREATIVE_ARTS • practical

A student is required to prepare three paint mixtures to obtain the following target colours on a colour chart: (i) a warm orange (hex #FF8C00), (ii) a cool violet (hex #8A2BE2), and (iii) a neutral gray (approximately 45 % reflectance). The only paints available are the primary pigments cadmium red, cadmium yellow, ultramarine blue, titanium white and black pigment. The student must determine the proportion (by weight) of each pigment in each mixture, mix the paints, record the observed colour, and compare the result with the target colour using a colour‑matching chart that gives a numerical colour difference ΔE (acceptable ΔE ≤ 5).

Question Parts

( a )

Describe a step‑by‑step procedure the student should follow to determine the correct proportions for each target colour. In your answer include how the principles of subtractive colour mixing and the colour‑matching chart are used.

( b )

For the warm orange target the student starts with a 1 : 1 ratio of red to yellow and adds ultramarine blue in small increments. The three trials give the following data (total mixture weight = 100 g): - Trial 1: 5 g blue added, ΔE = 12 - Trial 2: 8 g blue added, ΔE = 7 - Trial 3: x g blue added, ΔE = 4 (acceptable) Determine the value of x (to one decimal place) and give the percentage by weight of red, yellow and blue in the successful mixture.

( c )

Identify two possible sources of error that could cause ΔE values to be higher than expected and suggest one method to minimise each error.

( d )

To prepare the neutral gray the student mixes 30 g of black pigment with 70 g of white pigment. Black pigment reflects 5 % of incident light and white pigment reflects 90 %. Assuming the reflectance of the mixture is the weighted average of the components, calculate the overall reflectance percentage and state whether the mixture meets the target of a neutral gray (≈ 45 % reflectance).

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Bece Model Questions Vol1 2024 Cultural And Creative Arts Question 5. It is one of the practical questions from the 2024 Bece Model Questions Vol1 Cultural And Creative Arts examination.

The question covers Colour Theory, Subtractive colour mixing, Colour matching, Experimental procedure .

View More Bece Model Questions Vol1 2024 Cultural And Creative Arts Questions More Bece Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support