[Dan_San_Abbott]

Gary:
The 4:5 cross was a directive dated 13 May 1918. This change from the preceding balken cross to the 4:5 cross was ordered by IDFlieg. This cross form was applicable to the entire aircraft industry and all the field units. The dimensions specified that the horizontal arm be 4/5 of the vertical arm. the width of the arm was to be 1/8 of the vertical for both arms. The width of the right angle borders to be 1/4 the width of the arm. This 4:5 ratio form did not last very long, on 4 June 1918 IdFlieg sent out another directive changing the form from the 4: 5 ratio to 1:1 ratio on the arms length. All other characteristics remained the same.
When this 4:5 ratio was directed on 13 May 1918, the balken crosses had 150 mm wide white borders. The field units responded with a wide variety of interpretations of the directive, very few conformed precisely to the directive.
Those aircraft with painted camouflages could make the change fairly easy, however, those with printed fabric coverings, required over painting the white 150 mm borders with 100 mm wide grey areas.
Blue skies,
Dan-San