Fujifilm Prescale develops a color pattern that reveals contact pressure distribution. The color correlation chart supplied for your film grade helps you interpret that pattern under the specified test conditions.
This guide explains a practical reading workflow. Always use the instructions and chart for your exact film grade rather than a generic chart or an image reproduced online.
What Does the Chart Tell You?
Prescale uses pressure-sensitive microcapsules and a color-developing layer to produce a red pattern. Color density can be related to pressure using the appropriate chart and analysis procedure. Film grade, loading conditions, temperature, and humidity matter when interpreting results.
Step-by-Step: Using Your Supplied Chart
-
Confirm the grade and measurement range. Check that the chart matches the film used and that the expected pressure falls within its specified measurement range. For selection help, read How to Choose the Right Fujifilm Prescale Film for Your Application.
-
Prepare and expose the film. Follow the grade-specific instructions for sheet orientation, loading procedure, and loading duration. Keep the contact surfaces clean and handle the film without creasing or contaminating the measurement area.
-
Record the test conditions. Document temperature, relative humidity, film grade, loading duration, and the test setup. Confirm that the conditions meet the specified requirements.
-
Observe the developed pattern. Follow the prescribed timing and viewing conditions for analysis. Use consistent viewing conditions when comparing samples.
-
Compare color density and interpret pressure. Follow the sequence shown on your supplied chart. Where its instructions require a density comparison and a condition-specific curve, use the matching curve and read the labeled pressure units. Do not assume that every grade's chart has the same axes or layout.
-
Document the result. Record the interpreted pressure, location on the sample, chart used, analysis date, and test conditions. Retain a labeled photograph or scan as a visual record, using the prescribed analysis method when quantitative measurements are required.
Limits of Visual Interpretation
Visual color matching is an estimate, not an exact measurement. Use the manufacturer's stated accuracy and limitations for the specific grade, loading conditions, and analysis method. Do not apply one accuracy figure to every Prescale product or test setup.
If the developed color cannot be interpreted within the chart's supported range, check the film selection and test procedure before assigning a pressure value. Do not extrapolate beyond the specified measurement range without a validated method.
Digital Pressure Analysis
Compatible digital analysis tools can support image capture, pressure mapping, and reporting. Follow their requirements for capture, calibration, film grade, and test conditions. Digital analysis does not make a result exact or remove the film's measurement limitations.
Contact Pressure Metrics to discuss compatible analysis tools or available sample-analysis services for your purchase.
Frequently Asked Questions
What if the color falls between reference swatches?
Follow the interpolation guidance, if provided, in your grade-specific instructions. If the interpretation remains uncertain, seek support or use a compatible analysis method rather than reporting an exact value.
Can I use the film on curved or moving surfaces?
Confirm suitability for the specific geometry, loading conditions, and grade. Account for film thickness and handling requirements; flexibility alone does not establish that a test is suitable.
Can I reuse exposed film for another test?
Use fresh film for a new pressure test. Retain exposed samples according to the manufacturer's storage and analysis instructions rather than assuming their appearance will remain unchanged indefinitely.
How should I compare repeated tests?
Keep the grade, placement, loading procedure, environmental conditions, and analysis method consistent. Record differences between runs and investigate variability rather than assuming averaging alone resolves it.
Choose the Right Film Before Reading the Result
Explore our pressure-indicating film collection and consult the Prescale selection guide. Contact Pressure Metrics if you need help matching a grade or interpreting its supplied chart.
