Formulary's Residual Hypo Test is a simple chemical test that can be used to determine if a print or film strip has been adequately washed. The test is based upon the formation of a yellow stain of silver sulfide-silver thiosulfate on the white of a test print, or the clear area of a negative filmstrip when the test solution is applied. The test will give accurate results if the print or film has been treated with Hypo Clearing agent and washed in water or just washed in water. The test will not give accurate results if Hypo Eliminator has been used in the washing procedure. Hypo Eliminator contains ammonia which complexes with the silver ions in the Residual Hypo Test Solution decreasing their effective concentration.
Never run out of your favorites! Select our replenishment service to automatically receive a new shipment of your favorite items in the preferred frequency. Frequency can be selected from the available drop-down on each product page. Replenishment Service is easy and convenient. We offer the following cycles:
Monthly – every 30 days*
Bi-Monthly – every 60 days*
Quarterly – every 90 days*
Semi-Annually – every 180 days*
Your credit card will be charged for each order only when the item is shipped. You may cancel the service at any time by logging into your account.
*The number of days is calculated from the date of original order.
As a premier photo and video outlet, we are full line dealers for the entire range of photographic equipment and
supplies. Whether you are a leading professional or new to photography, our expert staff are always ready to
assist you in finding the perfect equipment at great prices.
Tel: (403) 234-9935
Toll Free: 1-888-539-9397
802 - 11th Ave SW
T2R 0E5 Canada