Hello. I just encountered an interesting problem. About a year ago, I tried RA-4 reversal processing. As I had problems with getting decent highlights, I now tried it again but got even worse highlights and overall gray image. I worked a few days with it and tried different kind of workarounds (adding halide solvent to first developer, etc.) as I believed in Tetenal RA-4 blix I had just made. But finally I found out that the blix was guilty to my problems. Having only a little bleaching and fixing power, it produced gray results that got even more gray in daylight. I just tried re-bleaching and fixing this time's first print. You can see the difference between re-bleach-fixed and original part: http://sorsa-tv.ath.cx/~antalh/siwachrome/scan011.jpg Seen this, I bleached and fixed again my reversal RA-4 tests from a year ago. But the blix wasn't the issue then; they were fine. So that time the poor highlights were due to too high developer dilution and/or too short dev time. Maybe I'll write about my reversal RA-4 experiments later, but now I'm troubled with the problem of defective blix. The funny thing starts here. I also tried bleaching and fixing again normal RA-4 prints I made two weeks ago - but they were fine. The only thing I did after that was that I made a new blix - but I used exactly the same concentrate. The blix I'm using now has quite large amount of solid matter in it. I have to rub it away when final washing the print... The previous Tetenal RA-4 kit didn't have this much crud in it. Have I done something wrong? How is it possible that the new blix made from the same concentrate as before is not working at all? Another problem I've found with this Tetenal blix - and maybe with the previous batch too, I'm not sure - is that the paper whites gets very yellowish and smudged if the blixing is carried on too long - 45 seconds seems to be maximum in order to get good results. Is this normal? Should I report this problem to Tetenal and/or try different blixes? As a workaround, I'm now using ferricyanide bleach and E6 (ammonium thiosulfate based) fixer. - Antti Alhonen.