The following is an extract from the inside front page of the booklet Johnson Chemicals, Tanks and Accessories believed to date to 1950.

"Every year Johnsons of Hendon hold a series of photographic competitions open to all amateurs. A large number of substantial cash prices are offered and there are consolation priozes as well. The main object of the contests is to improve the general standard of amateur photography and to encourage the casual snapshotter to concentrate on making better pictures. Ask your dealer for a leaflet giving all the details or write to us for one." 

Johnson Photographic Competitions for 1947.

Open to all amateur photographers. Pictures taken with any kind of camera are eligible. No entrance fees, only a label from one of the Johnson Photographic Chemicals.
Summer competition closes July 31st
Winter competition closes December 31st.

Subjects: Children, Animal, Home & Figure Studies, Landscape, Seascape, River & Street Scenes, Allotment, Garden, Flower & Tree Studies, Architectural, Interior & Table-Top Subjects.

60 Prizes in EACH competition, including 35 Cash prizes.
2 of £5, 3 of £2, 10 of £1, 20 of 10/- (50p) and 25 consolation prizes of photographic chemicals.

In 'Photography' magazine for October 1953 Johnsons ran a competition that had the instructions:
Can you write a Johnson Jingle ?

"So if you fancy writing verse,
In three-line jingles - apt and terse,
Try winning guineas for your purse,
from Johnsons."

Select a striking print of any subject you like. Attach a label from one of Johnsons Chemical preparations and then add a three-line jingle + your name and Address IN CAPITAL LETTERS.

Prints must be upright - not oblong - and not smaller than 4x5 or larger than 10x8 inches. The jingle should consist of three lines only, with each line containing eight 'feet' (the poetic term for syllables). LINE 1 should contain an apt reference to the subject of your picture. LINE 2 should refer to a contrasting alternative. LINE 3 should link the subjects, photographically, with JOHNSON CHEMICALS and do not forget that, when the verse is read aloud, it should trip smoothly off the tongue.

A prize of ONE GUINEA (= £1.10p) will be paid by Johnsons for each accepted print, provided it is accompanied by an amusing and appropriate three-line jingle. Enclose a stout envelope, self-addressed and stamped, for return of print and jingle if unsuccessful. No correspondence can be undertaken.

ADDRESS YOUR ENTRIES TO:
JINGLE DEPT;
JOHNSONS OF HENDON LTD;
LONDON, N.W.4

(Note that several Jingles appear overlapping at the top of the October advert. In the examples below, these are referred to as 'pre-October 1953')

Johnson Jingle No ??
Amateur Photographer (AP) magazine 1st April 1953

For boys with tadpoles in a jar,
And mother driving in her car,
Or any thing - from near or far,
Use Johnson Chemicals.

Johnson Jingle No ??
AP magazine 24th June 1953

For castles old and bridges new,
And scenes like fairyland come true,
Or snaps of daffodils at Kew,
Use Johnson Chemicals.

Johnson Jingle No 16
from 'Photography' magazine pre-October 1953

For girls upon the yellow sands,
And football crowds in Wembley stands,
Or snaps you made in other lands,
Use Johnson Chemicals.

Johnson Jingle No 19
from 'Photography' magazine pre-October 1953

For washing hanging on the line,
Or shipyards on the River Tyne,
And views you think extremely fine,
Use Johnson Chemicals.

Johnson Jingle No ??
from 'Photography' magazine pre-October 1953

For snaps of bright eyed little cubs,
And yokels outside country pubs,
Or prints you're showing at the clubs,
Use Johnson Chemicals.

Johnson Jingle No 22
from 'Photography' magazine September 1953

For Tigers feeding at the zoo,
Or Frenchmen saying Parlez Vous,
And snaps for me and snaps for you,
Use Johnsons Chemicals.

Johnson Jingle No 27
from 'Photography' magazine November 1953

For pictures of your canine pets,
And groups round television sets,
Or Eastern views with minarets,
Use Johnson Chemicals.

Johnson Jingle No 31
from 'Photography' magazine December 1953

For yachts becalmed on placid seas,
And sea-gulls in the Hebrides,
Or snaps of Aunty's Pekinese,
Use Johnson Chemicals.

Johnson Jingle No ??
from 'Photography' magazine December 1953

For sailing ships all moored in line,
And snaps of steamers on the Rhine,
Or prints that turn out really fine,
Use Johnson Chemicals. 

Johnson Jingle No 54
from AP magazine 17th March 1954

For twins who sing with verve and dash,
Or portraits that you take for cash,
And prints you hope to sell for cash,
Use Johnson Chemicals.

Johnson Jingle No 55
from AP magazine 24th March 1954

For portraits of a Siamese,
Or Yorkshire dales and forest trees,
And all things beautiful that please,
Use Johnson Chemicals.

Johnson Jingle No 94
from AP magazine 1st December 1954

"Why are your prints so clean and bright?"
I asked a chap the other night,
His answer quickly put me right,
Use Johnson Chemicals.

Johnson Jingle No 95
from AP magazine 8th December 1954

If you desire to gain success,
With pictures for the public press,
Then always - Oh! But you can guess!
Use Johnson Chemicals.