Blue gel filter with transmissions peaking at the primary and secondary colour wavelengths. For use in colour absorption, reflection etc. with ray boxes and projectors. Active area 35 × 25mm. Mounted in standard glass projector slide mounts
This product has met the following criteria:
 | Sustainable Distribution & Packaging Award | - Manufactured in the UK or Ireland
- Country of origin has an Environmental Performance Index (EPI) greater than 60
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