http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-283560-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_807b404155de04cce113f1f33e4e9f31 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C7-22 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C7-22 |
| filingDate | 1927-07-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1928-10-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-283560-A |
| titleOfInvention | Improvements relating to colour kinematography |
| abstract | 283,560. Gsch÷pf, R. Jan. 15, 1927. [Convention date]. Colour photography; dye-toning. - Negative colour records made respectively through a yellow filter, and through red and/or green filters adapted also to transmit blue, are printed on a film carrying emulsion on both sides, and one or more of the positives so produced are coloured, by first dyeing the image with one colour, then reducing the colour until the half-tones are free from dye, and finally dyeing the image with a different colour. In one example, negative records are taken simultaneously on films d,e, sensitized respectively for yellow-green with pinaflavol and for red with pinachrome-blue or pinacyanol-blue, in a camera having reflectors i in front of which rotate respectively a filter f of which one half is red but also transmits blue and the other half is yellow, and a filter g of which one half is green but also transmits blue and the other half is yellow. The red filter may comprise rhodamine B and acid violet, and the green filter acid green and patent blue, as distinguished from the usual red and green filters comprising respectively rhodamine B and tartrazine, and acid green and tartrazine. The films d, e thus receive alternately yellow records k and respectively red and green records l, m. These negatives are printed in register on opposite sides of a film carrying emulsion on both sides separated by an opaque wash-out layer, so that on the one hand the two yellow impressions coincide and on the other the red and green records coincide. The images on both sides are converted into a compound such as copper sulphocyanide acting as a mordant for basic dyes, whereafter the positive from negative d is dyed bluish-green as with brilliant green, and that from negative e is dyed bluish-red as with rhodamine or fuchsine. The images from the yellow records k are protected with varnish, and the remaining images are treated with a reducing bath, containing for example potassium bichromate and sulphuric acid, until the dye has been discharged from the half-tones. This bath does not affect the mordant, so that on now immersing the film in a bath of yellow dye such as thioflavin yellow, the half-tones are stained yellow while the remaining parts retain their original colours and merely acquire a yellow tinge. The film is now ready for projection. In another example, two colourrecord negatives are made simultaneously, one through a yellow filter upon a film sensitized for yellow-green, and the other through a red filter which also transmits blue, upon a film sensitized for red. These negatives are printed as before upon a. positive film sensitized on both sides; the positive from the negative taken through the red filter is coloured blue, as with methylene blue, and the other positive is first coloured with rhodamine red, then reduced to discharge the red from the half-tones, and the image is finally dyed yellow. The finished positive on projection exhibits all the colours approximately truly, excepting violet which is not accurately reproduced. |
| priorityDate | 1927-01-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 34.