65 TINTING STEPS 4.8 ALL RIGHTS RESERVED © LAB MOD SYSTEM FRAME PARTS TOOLS PLIERS EQUIPMENTS LENSES REFRACTION & ORTHOPTIC INDEX LAB CONSUMABLES PREPARING THE LENS Lenses should be edged first before tinting. Thoroughly cleaning and degreasing the lens before tinting allows for rapid and uniform tinting. Slowly immerse the lens into the hot tint bath: do not rush as a sudden temperature change may affect the lens surface. Keep the temperature at 92°C95 °C (198 - 203°F). TINTING Slowly immerse the lenses in holder into the hot tinting liquid to avoid splashing and lens strain. DYE BATH SHOULD ALWAYS BE BETWEEN 92°C - 95°C (198 - 203°F) At these high temperatures, the tint and CR39 molecules bond to form part of the lens structure. The lens continues to cure in the dyeing process and has a more scratch resistant surface. At a lower temperature the dyeing cycle is longer and there is difficulty in obtaining dark tints, this increases the possibility of inferior and unstable tinting of the lens. DO NOT DYE AT A HIGHER TEMPERATURES ABOVE 95ºC (203°F) • There is a greater water loss through evaporation. • Crystallisation of the dye will occur and colour consistency will fail. • Higher exposure to fumes in the working area. • Possible softening of the lens may require more careful handling. • More power used unnecessarily. HOW TO OBTAIN GRADIENT LENSES If you do no have a gradient unit use the lens holder. Prepare the lens as previously described. For prescription lenses, turn them upside down when placing them in the lens holder so the top of the lens is closest to the bottom of the tint pot. Immerse the holder until the dye covers the lens. Move the lens holder up and down and at the same time gradually withdrawing it from the solution until the lens has been completely withdrawn. With practice a perfect gradient will be achieved.The starting depth determines the start of the gradient line. COLOUR CORRECTION AFTER TINTING Immediately wash lenses and lens holder in clean cold water. As hot lenses scratch more easily this practice will help eliminate potential lens damage. The use of MACROCLEAN microfibre cloth is recommended. These clothes can be kept clean by regular washing. AVOID USING PAPER TISSUES THAT ARE NOT LINT OR ACID FREE. CHECK UV TRANSMITTANCE The UV & Visible Spectrotester (Ref. 05053) is ideal to test the UV and visible transmittance of a lens after tinting. BROWN LENSES Toomuch Dip lens into Red Grey and blue Grey Yellow Green Red, then Blue Blue Pink GREY LENSES Toomuch Dip lens into Brown Blue Purple Yellow Green Pink Blue Brown GREEN LENSES Toomuch Dip lens into Yellow Blue Grey Decolour Brown Blue Blue Brown or yellow
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