I am just wonder if anyone here was able to completely cleared the yellowing of the Bell and Howell 6 inches f/2.5 or AE 6 inches f/2.5 ?
I have no problem clearing out AE 7 inches' yellow in 1 day, but I am still trying to wrap up the remaining yellowing of B&H 6''.
Basically I found out this lens have both thorium on both front and the back groups, unlike the AE7 which has only in the rear group.
For tool , I used an LED 300 Watts grow light that I already have several years, which has full-spectrum and more UV than regular Ikea LED light .
It is also convenience because I can mass bleaching several thorium lenses at the same time. I surmise that the bleaching will speed up much with higher wattage , say 600 watts or 1200 watts
With this particular lens I was able to clear most of the yellowing within 2 days (12 hours per day) , about 90%, but it seems the last 10% is hard to get rid of.
FYI I am still using the LED light to clear off the remaining as mentioned above.
I post some pictures for your consideration, and a video as well (that has flickering which showed the pulsating emission) .
B&H Before Bleaching
B&H After 2 Days of Bleaching
Flickering video of the bleaching currently
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