view it is known that catalase decomposes peroxide at a high rate of effectiveness and is used in other connections e g within the textile industry for the process of removing peroxide by decomposing it into water and oxygen gas compared with other catalysts catalase has the great advantage that its activity exists at all ph values appearing in connection with normal bleaching ph 8 5 11 5 and within a relatively wide temperature range the sample must be cooled down at temperatures above approximately 70 u00b0 c as to the rest there is usually no substance present which could affect the activity or u201c poison u201d the catalase also the catalase has the great advantage that it can be used in exactly the same way for measuring the content of peracetic acid which will to an increasing extent be used in the future as a standard bleaching chemical within the pulp and paper industry bleaching with paracetic acid takes place within the ph interval 3 4 5 this does not cause any problems in connection with the use of catalase but it is essential that the equipment can tolerate the low ph value the high activity catalase recently developed also permits the dosage of catalase per sample to be kept at a very low volume.