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That usually happens after exposure. The more interesting information could be found reading article:"How to Integrate Volume Holographic Optical Elements (vHOE) made with Bayfol® HX Film into Plastic Optical Parts"

Some tips for HX200 and its color tunability in the enclosed table below, good luck!

Oh understood. Since the question is complex, let me spend some time for resume the answers for you guys then..

Hello, please send me an email and I will try to help you in solving this.
All the best and good luck!

All specs seams to be pretty much the same, we recommend using HX200 for stability and life time. I would say it is the best self-developing material, which currently freely available on the market.

Уважаемый Валерй!

Инфо по цене выдается лично после заполнение анкеты о конечном потребителе.
Информацию найдете в пристёжке..

The price indication is issued individually after filling simple end user questionnaire.
Please fill enclosed file and send it to ramunas@geola.com or info@geola.com. Thank you.

Yes, the HX200 is replacement of GP3C.

Здравствуйте Коллеги! Рад сообщить, что наряду с другими светочувствительными материалами, поставляемыми Geola Digital, с этого момента мы также предлагаем возможность приобрести полноцветную фотополимерную плёнку Bayfol® HX200 в двух форматах: в рулонах и в листах. Более подробную информацию о дост...

Hello Colleagues! I'm glad to announce that along other light sensitive materials supplied by Geola Digital from now on we also offer unique, self-processing Color Photopolymer Bayfol® HX200 film in two shapes, rolls and sheets. More information on available sizes and specs can be found on our websi...